Amateur GP based on Jukain's rework - I've kept their comments in square brackets. I apologise for my labelling being a tad ad-hoc.
Overview
########
Tyranitar has been one of the most successful Pokemon in OU ever since it(remove apostrophe)s introduction, and it's not hard to see why. Due to the sand it brings, it gains enormous special bulk that helps it fulfill a number of roles. Its impressive attacking stats, complemented by a wide offensive movepool and nearly unresisted STAB combination, give it significant threat and utility as a Choice Scarf user. Furthermore, in XY(remove comma) Tyranitar was gifted a faster, bulkier, and more powerful Mega Evolution that can become a terrifying sweeper with Dragon Dance; it is so bulky that it can set up on the likes of Talonflame, Pinsir, Starmie, and Latios. With a defensive set(remove comma) it can handle a number of common threats(remove comma) including Latios, Mega Charizard X and Y, and the aforementioned Flying-type attackers. It's also able to support certain offensive Pokemon with its sand(remove comma) such as Sand Rush Excadrill, Sand Force Landorus, and Mega Garchomp, as well as set up Stealth Rock.
Unfortunately, Tyranitar is plagued with a nasty 4x weakness to the Fighting-type, leaving it helpless against Fighting-types(remove comma) such as Conkeldurr, Keldeo, and Terrakion, in addition to matching up poorly against top(remove space)-tier threats Garchomp, Scizor, and Landorus. The introduction of Fairies and nerf to sandstorm in XY really hurt it as well. Last but not least, it's incredibly slow, putting it behind a majority of the offensive metagame, and its Mega Evolution is somewhat easy to revenge kill if weakened because of its priority weaknesses. However, even with its share of flaws(remove comma) Tyranitar's incredible versatility and the immense amount of team support it provides is nearly unparalleled, making it one of the most defining Pokemon of the OU metagame.
Choice Scarf
########
name: Choice Scarf
move 1: Pursuit
move 2: Crunch
move 3: Earthquake
move 4: Stone Edge
ability: Sand Stream
item: Choice Scarf
nature: Jolly
evs: 252 Atk / 4 Def / 252 Spe
Moves
========
A speedy Pursuit allows Tyranitar to checkmate Gengar, Starmie, Latias, and Latios(,) hitting them before they are even able to retaliate. Crunch provides it with a backup Dark-type STAB to hit bulkier Pokemon such as Trevenant and Slowbro. [pick better, more pertinent examples -- trevenant is pretty irrelevant, and even slowbro is to some degree -- mention slowbro and then something else that's more relevant in the metagame] Earthquake is very important for Aegislash, [it doesn't come near an ohko, mention this significant detail] which could threaten to lower Tyranitar's Attack with King's Shield on a Crunch or Pursuit, and hits Lucario, Heatran, Bisharp, and Excadrill harder than anything else. Stone Edge rounds off the set by giving Tyranitar a Rock-type STAB to revenge kill dangerous sweepers such as Volcarona, [how is it rking +1 volc?] Mega Pinsir, Mega Charizard Y, Mega Charizard X, Talonflame, and Dragonite. [doesn't dragonite just take it out with +1 eq/outrage?] Tyranitar's decent special movepool gives it a few other options to choose from. Ice Beam can surprise the unsuspecting Landorus-T and Gliscor who would otherwise easily switch into this set, as well as allow it to revenge kill Garchomp and Landorus. Fire Blast is yet another alternative that fries bulky Steel-types like Ferrothorn and Skarmory who take little damage from both of Tyranitar's STAB moves. If Terrakion and opposing Tyranitar are of concern, Superpower is also an option.
Set Details
========
With maximum Speed investment and a Jolly nature, Tyranitar is able to outspeed base 115 Speed Pokemon and below, putting it above a decent portion of the metagame. The rest is dumped into its Attack stat in order to hit as hard as possible.
Usage Tips
========
Choice Scarf Tyranitar is one of the best Pursuit trappers in the game because it's able to outspeed every common Psychic- and Ghost-type Pokemon in the tier. Unlike it(remove apostrophe)s other sets, Gengar and Starmie can not deal heavy damage to Tyranitar with their powerful attacks before being taken out by Pursuit. Keep in mind that even with a Choice Scarf, Tyranitar is still outsped by key Pokemon such as Alakazam, Tornadus-T, and Greninja, all of which can easily 2HKO Tyranitar with their coverage moves. Tyranitar's ability to revenge kill top(-)tier threats such as both Mega Charizard forms, Mega Pinsir, Thundurus, Talonflame, and Gyarados, as well as being able to Pursuit trap, is invaluable for most teams, making it a great choice for offensive teams. [this last sentence is not really a usage tip. maybe something for team options, but it has nothing to do with the in-battle decision-making and play that are supposed to be covered in this section (you do a great job btw !_!)]
Team Options
========
Tyranitar pairs well with Pokemon that appreciate the lack of Ghost- and Psychic-types. Keldeo and Landorus in particular struggle to break through Latias and Latios; once they're gone, it's much easier for them to blow through opposing teams. Ty(r)anitar itself needs a Pokemon to deal with Fighting-types; Mega Pinsir and Talonflame can check the majority of them with their priority Flying-type attacks. Mega Venusaur has great defensive synergy with Tyranitar, as it is able to switch into Fighting-, Fairy-, and Water-type attacks with ease. As with most of its sets, Tyranitar appreciates being able to switch(remove hyphen) in frequently, so pairing it with a Rapid Spin user, such as Excadrill, or a Defog user, such as Skarmory, is highly recommended.
Dragon Dance
########
name: Dragon Dance
move 1: Dragon Dance
move 2: Stone Edge
move 3: Ice Punch / Crunch
move 4: Earthquake
ability: Sand Stream
item: Tyranitarite
nature: Jolly
evs: 252 Atk / 4 Def / 252 Spe
Moves
========
Dragon Dance turns Mega Tyranitar into one of the most powerful sweepers in the metagame, capable of plowing through offensive and defensive teams alike. After one Dragon Dance, it hits a whopping 640 Attack and 397 Speed, giving it an insane amount of power to work with, along with enough Speed to outpace most of the unboosted metagame. Stone Edge is Mega Tyranitar's STAB move of choice, as it is able to OHKO pretty much anything that doesn't resist it after a boost and even easily 2HKO physically defensive Skarmory. Ice Punch provides Mega Tyranitar with a important coverage move to hit some of its common checks and counters really hard, such as Landorus-T, Gliscor, and Garchomp, while dealing solid damage to Hippowdon. Crunch on the other hand is a powerful Dark-type STAB move that hits Ferrothorn and Slowbro harder than anything else, but th(e)n Mega Tyranitar will struggle to break through bulky Ground-types. [move this comment up to right after stone edge (you agreed to slash crunch there instead of with ice punch) and mention the accuracy benefit] Earthquake rounds off the set by hitting Aegislash without having to worry about the massive Attack drop from King's Shield, as well as hitting Lucario, Bisharp, Terrakion, Excadrill, and opposing Tyranitar [i'd mention ohko on heatran before it can toxic or wisp you (before setup) -- also weakened keldeo] for super effective damage. Fire Punch is a decent option in the last moveslot to OHKO Scizor and Ferrothorn at +1, but Stone Edge already hits Scizor hard enough, and hitting Ferrothorn isn't really worth giving up the extra coverage that Earthquake has.
Set Details
========
Max Attack and Speed investment with a Jolly nature are so that Mega Tyranitar can hit as hard as possible while being able to outspeed a majority of the unboosted metagame after a boost. [more like everything besides deo-s -- i'd be specific here because it's not a few things, it's one mon] Tyranitarite allows Tyranitar to Mega Evolve, which gives it much higher Attack, defenses, and Speed. Although an Adamant nature might seem tempting due to the incredible boost in power, Mega Tyranitar will miss out on out(remove space)speeding key Pokemon(remove comma) such as Greninja and Alakazam.
Usage Tips
========
Aside from the obvious fact that Mega Tyranitar has a higher Attack and Speed stat, its buffed defenses are an incredible asset to it as well. It's so bulky, in fact, that it only takes 66.66 - 78.94% from Choice Band Scizor's Bullet Punch and 66.9 - 79.8% from Life Orb Greninja's Hydro Pump in the sand. This gives Mega Tyranitar the ability to set up on most Pokemon that lack a powerful super effective move to hit it with, as well as a few that do, such as Starmie, Kyurem-B, and Mega Pinsir. [don't forget to mention the chomp/lando-t eqs we talked about -- this is probably the place to do so] Even with this extra bulk, it isn't recommended to set up when its checks are still present, as most of its common checks can severely cripple Mega Tyranitar or put it into a range where it can easily be worn down by priority. Still, Mega Tyranitar can survive all forms of priority moves at least once at full health, so keep that in mind. Dragon Dance Mega Tyranitar fits very well on offensive teams that contain powerful wallbreakers and other sweepers that can break its common checks and counters in order for it to sweep. [this last sentence is more like a team options thing, not a usage tip]
Team Options
========
Common offensive Pokemon such as Mamoswine, Excadrill, Terrakion, Lucario, Scizor, Keldeo, and Conkeldurr all threaten to deal massive damage to Mega Tyranitar and prevent it from setting up to sweep. Talonflame can handle most of the Fighting-types in the tier with its priority Brave Bird, and can soften up physical walls so that Mega Tyranitar has an easier time sweeping. Keldeo is an amazing wallbreaker [i wouldn't go this far, it has a lot of defensive checks] that can easily break through Landorus-T, Hippowdon, and Gliscor, which are great checks to Mega Tyranitar. Scizor can check Clefable and Azumarill which threaten to stop Mega Tyranitar from sweeping. Entry hazards are very important in securing specific OHKOs at +1, such as Gliscor and Scizor. Deoxys-S or Deoxys-D are usually the best fit for the job because they fit very well on the offensive teams that Mega Tyranitar is usually going to be on, and they can practically guarantee Stealth Rock. [you should mention wearing down mega venu, which can be a pain due to taking the +1 sedge and potentially sleep powdering tar, ending its sweep -- skarm can also be a big pain with whirlwind, in my experience]
Physically Defensive
########
name: Support
move 1: Stealth Rock / Fire Blast
move 2: Crunch
move 3: Ice Beam / Stone Edge
move 4: Earthquake
ability: Sand Stream
item: Leftovers
nature: Relaxed / Impish
evs: 248 HP / 252 Def / 8 SpD
Moves
========
[the first two sentences here don't belong in moves -- a section to talk about moves -- you can move the info to usage tips if you want]Because of Tyranitar's incredible bulk and useful resistances to Flying(remove hyphen), Fire(remove hyphen)(remove comma) and Dark, it's easily one of the most reliable users of Stealth Rock in the tier. However, if something else on your team is already using Stealth Rock, Fire Blast is a fine alternative to kill the bulky Steel-types, such as Skarmory, Scizor, and Ferrothorn, that Tyranitar lures out. Crunch is Tyranitar's STAB Dark-type move of choice to hit Psychic-types such as Latias and Latios, as well as Gengar. Ice Beam keeps Landorus-T, Gliscor, and Hippowdon from completely walling Tyranitar, as well as keeping Garchomp from freely switching in. Earthquake provides Tyranitar with a reliable way to hit Aegislash without having to worry about the massive Attack drop from King's Shield. Stone Edge can be used if you want a Rock STAB to OHKO Talonflame and Mega Pinsir. [maybe mention mega charizard y?] Pursuit can be used to trap Psychic-types such as Latios and Latias, but it's very weak without Attack investment, and Tyranitar prefers the extra coverage from Ice Beam.
Set Details
========
Full physical investment with a positive nature in conjunction with Tyranitar's enormous sand-enhanced special bulk makes it one of the bulkiest mixed walls in the game. Leftovers is the preferred item for extra, much(remove space)-needed longevity that Tyranitar does not otherwise possess due to its lack of reliable recovery. An Assault Vest can be used if you want Tyranitar to be an even better mixed wall, but it'll have to forgo the ability run Stealth Rock and will greatly miss out on Leftovers recovery. Smooth Rock allows Sandstorm to be up for eight turns instead of five, but the loss in longevity isn't really worth it, and Hippowdon is arguably a better choice for the job anyway because of its access to reliable recovery. Tyranitarite allows Tyranitar to Mega Evolve and obtain a significant boost to both of its defenses and (its) Attack stat. The downside of this is that it loses out on the ability to run Leftovers for extra longevity, so it is worn down quickly and also uses up your team's Mega slot. Chople Berry allows Tyranitar to take even less damage from Aegislash's Sacred Sword and Mega Charizard Y's Focus Blast in the sun, allowing Tyranitar to tank a hit and deal heavy damage to them in return.
Usage Tips
========
This set is best used on teams in need of a reliable user of Stealth Rock and check to very prominent physical attackers in the tier, such as Mega Pinsir and Talonflame. Although it's not nearly as sturdy as Hippowdon, Tyranitar still does a very good job at keeping the (s)and up, so if your team needs (s)and(remove comma) this set is one of the best at keeping it up because of its insane amount of bulk. Tyranitar has the advantage of having a more offensive presence than Hippowdon, making it a better fit for more offensive(remove: ly based) teams. Keep in mind that Tyranitar can be worn down relatively easily due to its lack of reliable recovery, so it's important to switch it in sparingly.
Team Options
========
Tyranitar is completely shut down by most Fighting-types, so pairing it with teammates that can both check and counter them is essential. Gourgeist and Trevanent are very good switch-ins to a large portion of Fighting-types in the tier, such as Keldeo, Lucario, Breloom, Conkeldurr and Terrakion, and they are able to burn them with Will-O-Wisp. Landorus-T checks Scizor and (remove: it )can provide Tyranitar with free switch-ins thanks to U-turn. Talonflame checks all Fighting-types with priority Brave Bird and can roast Steel-types with Flare Blitz. Keldeo, Mega Charizard Y, and Landorus are great offensive partners because Tyranitar puts a lot of pressure on Latias and Latios. Finally, keeping entry hazards off the field is essential in keeping Tyranitar healthy. Skarmory has great defensive synergy with Tyranitar and can use Defog to clear away entry hazards. Excadrill can utilize its Sand Rush ability to outrun virtually the entire tier when paired with Tyranitar, and has access to Rapid Spin, making them great partners.
Choice Band
########
name: Choice Band
move 1: Crunch
move 2: Pursuit
move 3: Stone Edge
move 4: Earthquake / Ice Punch
ability: Sand Stream
item: Choice Band
nature: Adamant
evs: 180 HP / 252 Atk / 76 Spe
Moves
========
When equipped with a Choice Band(remove comma) Tyranitar becomes a fearsome wallbreaker capable of punching massive holes into opposing teams. Crunch is a powerful Dark-type STAB that hits anything that doesn't resist it extremely hard, and due to the Steel-type nerf, popular defensive Steel-types(remove comma) such as Ferrothorn and Skarmory(remove comma) can no longer reliably switch into it. It's best for hitting bulky Ghost- and Psychic-types such as Slowbro, Latias, and Jellicent. Pursuit is even more threatening on this set because it's capable of OHKOing Starmie, Latios, and even Latias with a bit of residual damage, even if they choose not to switch out. Stone Edge provides Tyranitar with yet another powerful STAB move to OHKO Mega Pinsir, Volcarona, Kyurem-B, and Talonflame, in addition to hitting Fairy-types such as Azumarill for neutral, severe damage. Earthquake gives Tyranitar a way to hit Aegislash reliably without having to worry about the Attack drop from King's Shield, and it also hits Lucario and opposing Tyranitar for super effective damage. Ice Punch is a viable alternative to Earthquake if none of these threats are an issue, as it allows for Tyranitar to deal heavy damage to Landorus-T, Gliscor, and Garchomp. Fire Punch is also an option to KO Ferrothorn and Scizor, but it doesn't supply Tyranitar with as much useful coverage as Earthquake or Ice Punch, because Stone Edge and Crunch hit both of these Pokemon hard enough anyway.
Set Details
========
The Attack and Speed EVs ensure that Tyranitar hits as hard as possible, while outpacing Skarmory so it can 2HKO with Stone Edge before it can Roost off the damage. Everything else is dumped into its HP stat so it remains as bulky as possible.
Usage Tips
========
Choice Band Tyranitar is meant to function as a powerful wallbreaker that should be used on teams in need of something to soften up walls such as Skarmory, Ferrothorn, and Gourgeist. This makes it a lot easier for a teammate to sweep or clean up once its counters are heavily weakened by Tyranitar. Tyranitar's insane bulk makes it more than capable of switching into a plethora of non-super effective special attacks, which can consistently put a lot of pressure on offensive teams that lack a good switch-in. Take caution when locking yourself into Crunch or Pursuit, because Lucario and Terrakion are very dangerous, and letting them get a free turn of set(remove space)up or a Justified boost can potentially lose you the battle. Overall, this set does not function very well( on) fast(hyphen)paced offensive teams because of how vulnerable it is once it's locked into a move due to its common exploitable weaknesses. It's a better fit on bulky offensive teams that need a wallbreaker to break down common defensive cores.
Team Options
========
Fighting-type Pok(é)mon(remove comma) such as Conkeldurr, Keldeo, and Terrakion(remove comma) completely destroy Tyranitar, as they resist both of its STAB moves. [i wouldn't go this far...each of these take ~half from Stone Edge, so they can't switch in more than once] Breloom is a great check to both Terrakion and Keldeo, [breloom, a great check? it can revenge kill with priority, that's about it -- your latios example is way better] while Latios resists their Fighting-type attacks and threatens them with Psyshock. This Tyranitar also pairs well with offensive partners that appreciate their counters heavily weakened. Mega Scizor has a lot of trouble breaking through Skarmory, Landorus-T, and Gourgeist, but Tyranitar can soften them up to a point where it can sweep afterwards. Talonflame can check Fighting-types( and) also enjoys( having) physically defensive Pok(é)mon heavily weakened. Sand Rush Excadrill benefits from Tyranitar's Sand Stream ability and can also clear entry hazards off the field with Rapid Spin, which greatly improves Tyranitar's longevity.
Other Options
########
Tyranitar is a very versatile Pok(é)mon, so it has plenty of other options to choose from. A specially defensive set can be used if you want Tyranitar to function as more of a special sponge, but it's not recommended because Tyranitar will primarily want to check physical attackers. [exactly how true is this? it's the best latios/latias counter in the tier] A lead Focus Sash attacker set with Fire Blast and Ice Beam can be a great lure to most physical walls such as Skarmory and Landorus-T, but it loses out on a lot of utility. [mention stealth rock for this set] A Curse set might seem viable because of Tyranitar's impressive defenses, especially in its Mega Evolution, but it's still very prone to being worn down quickly due to its exploitable weaknesses and lack of reliable recovery, [mention it's crappy speed here] so it's mostly overshadowed by the Dragon Dance set. Roar and Dragon Tail can phaze out sweepers that might try to set up on it(remove comma) as well as wear down the opposing team with entry hazard support. Thunder Wave can cripple Tyranitar's common switch-ins such as Lucario, Terrakion, and Keldeo. RestTalk is a much more viable strategy in XY due to the return of the old sleep mechanics, but it can't really fit the move combination anywhere without giving up a lot of coverage or utility. Aqua Tail hits Hippowdon harder than any other move in its arsenal, but it's better off running an Ice-type attack to beat Gliscor, Landorus-T, and Garchomp.
Checks & Counters
########
**Physically Defensive Walls**: Pok(é)mon with very high Defense have little trouble dealing with most of Tyranitar's sets. Hippowdon is the best full stop to Tyranitar in OU because of its access to reliable recovery, enormous physical bulk, and Ground-type, which allows it to easily switch into Stone Edge and Crunch with ease. Landorus-T and Gliscor are also fantastic checks to Tyranitar, [not really so fantastic when dd w/ ice punch is one of if not the most common set] fearing only a boosted Ice Punch from Mega Tyranitar and the stray Ice Beam. Skarmory fears very little from Tyranitar ats thanks to its access to Roost and high Defense stat. [can't switch into cb stone edge, and has to watch out for the random fire blast] Ferrothorn resists Stone Edge, takes little from Crunch, and threatens to deal heavy damage with Gyro Ball. Chesnaught resists both of Tyranitar's STAB moves and can set up entry hazards all over it. [is setting up entry hazards really the most relevant thing it can do against ttar? more like, stall with leech seed or ko with hammer arm]
**Fighting- and Ground-types**: Because of Tyranitar's crippling 4x weakness to Fighting-type attacks, Fighting-types are obviously some of the best checks to it in the game. Terrakion and Lucario can both receive an Attack boost with their Justified ability if they happen to switch into a Dark-type move. Keldeo(remove space), Breloom, and Conkeldurr also fear little from Tyranitar and can easily OHKO it. Diggersby, Garchomp, and Landorus are also great checks to Tyranitar with their powerful Ground-type attacks. [mention that garchomp, if is not carrying a life orb, does not even ohko mega tyranitar after stealth rock damage -- so, scarfchomp can't revenge kill it if it's high on health -- also phys def tar can just take around half from eq and kill it if it's lost ~20% with ice beam]
**Steel- and Fairy-types**: Scizor is a fantastic check because of its priority Bullet Punch. Both of Excadrill's STAB moves threaten to deal serious damage to Tyranitar. Mega Mawile resists both of its STAB moves and can easily OHKO back with Play Rough. [it does take a hell of a lot from eq, though] Azumarill can also destroy Tyranitar with Play Rough(remove comma) as well as pick off weakened Dragon Dance variants with Aqua Jet. Unaware Clefable can stop Mega Tyranitar short of a sweep, absorbing any attack with its great physical bulk and access to reliable recovery(remove: makes it very difficult to take down). [stone edge does 2hko with sr + 1 layer of spikes, though, so clefable isn't exactly switching in for free if mega tar is paired with deo-d to stack hazards, which is common]
**Politoed**: Politoed on its own is a huge threat to Tyranitar because of its Drizzle ability. This not only cancels out Tyranitar's Sand Stream ability upon activation, but also allows Politoed to KO with its powerful Water-type attacks(remove comma) as they are unhindered by sand. On top of this, Politoed is usually paired with other Water-types such as Kingdra or Kabutops which also threaten Tyranitar.
########
Tyranitar has been one of the most successful Pokemon in OU ever since it(remove apostrophe)s introduction, and it's not hard to see why. Due to the sand it brings, it gains enormous special bulk that helps it fulfill a number of roles. Its impressive attacking stats, complemented by a wide offensive movepool and nearly unresisted STAB combination, give it significant threat and utility as a Choice Scarf user. Furthermore, in XY(remove comma) Tyranitar was gifted a faster, bulkier, and more powerful Mega Evolution that can become a terrifying sweeper with Dragon Dance; it is so bulky that it can set up on the likes of Talonflame, Pinsir, Starmie, and Latios. With a defensive set(remove comma) it can handle a number of common threats(remove comma) including Latios, Mega Charizard X and Y, and the aforementioned Flying-type attackers. It's also able to support certain offensive Pokemon with its sand(remove comma) such as Sand Rush Excadrill, Sand Force Landorus, and Mega Garchomp, as well as set up Stealth Rock.
Unfortunately, Tyranitar is plagued with a nasty 4x weakness to the Fighting-type, leaving it helpless against Fighting-types(remove comma) such as Conkeldurr, Keldeo, and Terrakion, in addition to matching up poorly against top(remove space)-tier threats Garchomp, Scizor, and Landorus. The introduction of Fairies and nerf to sandstorm in XY really hurt it as well. Last but not least, it's incredibly slow, putting it behind a majority of the offensive metagame, and its Mega Evolution is somewhat easy to revenge kill if weakened because of its priority weaknesses. However, even with its share of flaws(remove comma) Tyranitar's incredible versatility and the immense amount of team support it provides is nearly unparalleled, making it one of the most defining Pokemon of the OU metagame.
Choice Scarf
########
name: Choice Scarf
move 1: Pursuit
move 2: Crunch
move 3: Earthquake
move 4: Stone Edge
ability: Sand Stream
item: Choice Scarf
nature: Jolly
evs: 252 Atk / 4 Def / 252 Spe
Moves
========
A speedy Pursuit allows Tyranitar to checkmate Gengar, Starmie, Latias, and Latios(,) hitting them before they are even able to retaliate. Crunch provides it with a backup Dark-type STAB to hit bulkier Pokemon such as Trevenant and Slowbro. [pick better, more pertinent examples -- trevenant is pretty irrelevant, and even slowbro is to some degree -- mention slowbro and then something else that's more relevant in the metagame] Earthquake is very important for Aegislash, [it doesn't come near an ohko, mention this significant detail] which could threaten to lower Tyranitar's Attack with King's Shield on a Crunch or Pursuit, and hits Lucario, Heatran, Bisharp, and Excadrill harder than anything else. Stone Edge rounds off the set by giving Tyranitar a Rock-type STAB to revenge kill dangerous sweepers such as Volcarona, [how is it rking +1 volc?] Mega Pinsir, Mega Charizard Y, Mega Charizard X, Talonflame, and Dragonite. [doesn't dragonite just take it out with +1 eq/outrage?] Tyranitar's decent special movepool gives it a few other options to choose from. Ice Beam can surprise the unsuspecting Landorus-T and Gliscor who would otherwise easily switch into this set, as well as allow it to revenge kill Garchomp and Landorus. Fire Blast is yet another alternative that fries bulky Steel-types like Ferrothorn and Skarmory who take little damage from both of Tyranitar's STAB moves. If Terrakion and opposing Tyranitar are of concern, Superpower is also an option.
Set Details
========
With maximum Speed investment and a Jolly nature, Tyranitar is able to outspeed base 115 Speed Pokemon and below, putting it above a decent portion of the metagame. The rest is dumped into its Attack stat in order to hit as hard as possible.
Usage Tips
========
Choice Scarf Tyranitar is one of the best Pursuit trappers in the game because it's able to outspeed every common Psychic- and Ghost-type Pokemon in the tier. Unlike it(remove apostrophe)s other sets, Gengar and Starmie can not deal heavy damage to Tyranitar with their powerful attacks before being taken out by Pursuit. Keep in mind that even with a Choice Scarf, Tyranitar is still outsped by key Pokemon such as Alakazam, Tornadus-T, and Greninja, all of which can easily 2HKO Tyranitar with their coverage moves. Tyranitar's ability to revenge kill top(-)tier threats such as both Mega Charizard forms, Mega Pinsir, Thundurus, Talonflame, and Gyarados, as well as being able to Pursuit trap, is invaluable for most teams, making it a great choice for offensive teams. [this last sentence is not really a usage tip. maybe something for team options, but it has nothing to do with the in-battle decision-making and play that are supposed to be covered in this section (you do a great job btw !_!)]
Team Options
========
Tyranitar pairs well with Pokemon that appreciate the lack of Ghost- and Psychic-types. Keldeo and Landorus in particular struggle to break through Latias and Latios; once they're gone, it's much easier for them to blow through opposing teams. Ty(r)anitar itself needs a Pokemon to deal with Fighting-types; Mega Pinsir and Talonflame can check the majority of them with their priority Flying-type attacks. Mega Venusaur has great defensive synergy with Tyranitar, as it is able to switch into Fighting-, Fairy-, and Water-type attacks with ease. As with most of its sets, Tyranitar appreciates being able to switch(remove hyphen) in frequently, so pairing it with a Rapid Spin user, such as Excadrill, or a Defog user, such as Skarmory, is highly recommended.
Dragon Dance
########
name: Dragon Dance
move 1: Dragon Dance
move 2: Stone Edge
move 3: Ice Punch / Crunch
move 4: Earthquake
ability: Sand Stream
item: Tyranitarite
nature: Jolly
evs: 252 Atk / 4 Def / 252 Spe
Moves
========
Dragon Dance turns Mega Tyranitar into one of the most powerful sweepers in the metagame, capable of plowing through offensive and defensive teams alike. After one Dragon Dance, it hits a whopping 640 Attack and 397 Speed, giving it an insane amount of power to work with, along with enough Speed to outpace most of the unboosted metagame. Stone Edge is Mega Tyranitar's STAB move of choice, as it is able to OHKO pretty much anything that doesn't resist it after a boost and even easily 2HKO physically defensive Skarmory. Ice Punch provides Mega Tyranitar with a important coverage move to hit some of its common checks and counters really hard, such as Landorus-T, Gliscor, and Garchomp, while dealing solid damage to Hippowdon. Crunch on the other hand is a powerful Dark-type STAB move that hits Ferrothorn and Slowbro harder than anything else, but th(e)n Mega Tyranitar will struggle to break through bulky Ground-types. [move this comment up to right after stone edge (you agreed to slash crunch there instead of with ice punch) and mention the accuracy benefit] Earthquake rounds off the set by hitting Aegislash without having to worry about the massive Attack drop from King's Shield, as well as hitting Lucario, Bisharp, Terrakion, Excadrill, and opposing Tyranitar [i'd mention ohko on heatran before it can toxic or wisp you (before setup) -- also weakened keldeo] for super effective damage. Fire Punch is a decent option in the last moveslot to OHKO Scizor and Ferrothorn at +1, but Stone Edge already hits Scizor hard enough, and hitting Ferrothorn isn't really worth giving up the extra coverage that Earthquake has.
Set Details
========
Max Attack and Speed investment with a Jolly nature are so that Mega Tyranitar can hit as hard as possible while being able to outspeed a majority of the unboosted metagame after a boost. [more like everything besides deo-s -- i'd be specific here because it's not a few things, it's one mon] Tyranitarite allows Tyranitar to Mega Evolve, which gives it much higher Attack, defenses, and Speed. Although an Adamant nature might seem tempting due to the incredible boost in power, Mega Tyranitar will miss out on out(remove space)speeding key Pokemon(remove comma) such as Greninja and Alakazam.
Usage Tips
========
Aside from the obvious fact that Mega Tyranitar has a higher Attack and Speed stat, its buffed defenses are an incredible asset to it as well. It's so bulky, in fact, that it only takes 66.66 - 78.94% from Choice Band Scizor's Bullet Punch and 66.9 - 79.8% from Life Orb Greninja's Hydro Pump in the sand. This gives Mega Tyranitar the ability to set up on most Pokemon that lack a powerful super effective move to hit it with, as well as a few that do, such as Starmie, Kyurem-B, and Mega Pinsir. [don't forget to mention the chomp/lando-t eqs we talked about -- this is probably the place to do so] Even with this extra bulk, it isn't recommended to set up when its checks are still present, as most of its common checks can severely cripple Mega Tyranitar or put it into a range where it can easily be worn down by priority. Still, Mega Tyranitar can survive all forms of priority moves at least once at full health, so keep that in mind. Dragon Dance Mega Tyranitar fits very well on offensive teams that contain powerful wallbreakers and other sweepers that can break its common checks and counters in order for it to sweep. [this last sentence is more like a team options thing, not a usage tip]
Team Options
========
Common offensive Pokemon such as Mamoswine, Excadrill, Terrakion, Lucario, Scizor, Keldeo, and Conkeldurr all threaten to deal massive damage to Mega Tyranitar and prevent it from setting up to sweep. Talonflame can handle most of the Fighting-types in the tier with its priority Brave Bird, and can soften up physical walls so that Mega Tyranitar has an easier time sweeping. Keldeo is an amazing wallbreaker [i wouldn't go this far, it has a lot of defensive checks] that can easily break through Landorus-T, Hippowdon, and Gliscor, which are great checks to Mega Tyranitar. Scizor can check Clefable and Azumarill which threaten to stop Mega Tyranitar from sweeping. Entry hazards are very important in securing specific OHKOs at +1, such as Gliscor and Scizor. Deoxys-S or Deoxys-D are usually the best fit for the job because they fit very well on the offensive teams that Mega Tyranitar is usually going to be on, and they can practically guarantee Stealth Rock. [you should mention wearing down mega venu, which can be a pain due to taking the +1 sedge and potentially sleep powdering tar, ending its sweep -- skarm can also be a big pain with whirlwind, in my experience]
Physically Defensive
########
name: Support
move 1: Stealth Rock / Fire Blast
move 2: Crunch
move 3: Ice Beam / Stone Edge
move 4: Earthquake
ability: Sand Stream
item: Leftovers
nature: Relaxed / Impish
evs: 248 HP / 252 Def / 8 SpD
Moves
========
[the first two sentences here don't belong in moves -- a section to talk about moves -- you can move the info to usage tips if you want]Because of Tyranitar's incredible bulk and useful resistances to Flying(remove hyphen), Fire(remove hyphen)(remove comma) and Dark, it's easily one of the most reliable users of Stealth Rock in the tier. However, if something else on your team is already using Stealth Rock, Fire Blast is a fine alternative to kill the bulky Steel-types, such as Skarmory, Scizor, and Ferrothorn, that Tyranitar lures out. Crunch is Tyranitar's STAB Dark-type move of choice to hit Psychic-types such as Latias and Latios, as well as Gengar. Ice Beam keeps Landorus-T, Gliscor, and Hippowdon from completely walling Tyranitar, as well as keeping Garchomp from freely switching in. Earthquake provides Tyranitar with a reliable way to hit Aegislash without having to worry about the massive Attack drop from King's Shield. Stone Edge can be used if you want a Rock STAB to OHKO Talonflame and Mega Pinsir. [maybe mention mega charizard y?] Pursuit can be used to trap Psychic-types such as Latios and Latias, but it's very weak without Attack investment, and Tyranitar prefers the extra coverage from Ice Beam.
Set Details
========
Full physical investment with a positive nature in conjunction with Tyranitar's enormous sand-enhanced special bulk makes it one of the bulkiest mixed walls in the game. Leftovers is the preferred item for extra, much(remove space)-needed longevity that Tyranitar does not otherwise possess due to its lack of reliable recovery. An Assault Vest can be used if you want Tyranitar to be an even better mixed wall, but it'll have to forgo the ability run Stealth Rock and will greatly miss out on Leftovers recovery. Smooth Rock allows Sandstorm to be up for eight turns instead of five, but the loss in longevity isn't really worth it, and Hippowdon is arguably a better choice for the job anyway because of its access to reliable recovery. Tyranitarite allows Tyranitar to Mega Evolve and obtain a significant boost to both of its defenses and (its) Attack stat. The downside of this is that it loses out on the ability to run Leftovers for extra longevity, so it is worn down quickly and also uses up your team's Mega slot. Chople Berry allows Tyranitar to take even less damage from Aegislash's Sacred Sword and Mega Charizard Y's Focus Blast in the sun, allowing Tyranitar to tank a hit and deal heavy damage to them in return.
Usage Tips
========
This set is best used on teams in need of a reliable user of Stealth Rock and check to very prominent physical attackers in the tier, such as Mega Pinsir and Talonflame. Although it's not nearly as sturdy as Hippowdon, Tyranitar still does a very good job at keeping the (s)and up, so if your team needs (s)and(remove comma) this set is one of the best at keeping it up because of its insane amount of bulk. Tyranitar has the advantage of having a more offensive presence than Hippowdon, making it a better fit for more offensive(remove: ly based) teams. Keep in mind that Tyranitar can be worn down relatively easily due to its lack of reliable recovery, so it's important to switch it in sparingly.
Team Options
========
Tyranitar is completely shut down by most Fighting-types, so pairing it with teammates that can both check and counter them is essential. Gourgeist and Trevanent are very good switch-ins to a large portion of Fighting-types in the tier, such as Keldeo, Lucario, Breloom, Conkeldurr and Terrakion, and they are able to burn them with Will-O-Wisp. Landorus-T checks Scizor and (remove: it )can provide Tyranitar with free switch-ins thanks to U-turn. Talonflame checks all Fighting-types with priority Brave Bird and can roast Steel-types with Flare Blitz. Keldeo, Mega Charizard Y, and Landorus are great offensive partners because Tyranitar puts a lot of pressure on Latias and Latios. Finally, keeping entry hazards off the field is essential in keeping Tyranitar healthy. Skarmory has great defensive synergy with Tyranitar and can use Defog to clear away entry hazards. Excadrill can utilize its Sand Rush ability to outrun virtually the entire tier when paired with Tyranitar, and has access to Rapid Spin, making them great partners.
Choice Band
########
name: Choice Band
move 1: Crunch
move 2: Pursuit
move 3: Stone Edge
move 4: Earthquake / Ice Punch
ability: Sand Stream
item: Choice Band
nature: Adamant
evs: 180 HP / 252 Atk / 76 Spe
Moves
========
When equipped with a Choice Band(remove comma) Tyranitar becomes a fearsome wallbreaker capable of punching massive holes into opposing teams. Crunch is a powerful Dark-type STAB that hits anything that doesn't resist it extremely hard, and due to the Steel-type nerf, popular defensive Steel-types(remove comma) such as Ferrothorn and Skarmory(remove comma) can no longer reliably switch into it. It's best for hitting bulky Ghost- and Psychic-types such as Slowbro, Latias, and Jellicent. Pursuit is even more threatening on this set because it's capable of OHKOing Starmie, Latios, and even Latias with a bit of residual damage, even if they choose not to switch out. Stone Edge provides Tyranitar with yet another powerful STAB move to OHKO Mega Pinsir, Volcarona, Kyurem-B, and Talonflame, in addition to hitting Fairy-types such as Azumarill for neutral, severe damage. Earthquake gives Tyranitar a way to hit Aegislash reliably without having to worry about the Attack drop from King's Shield, and it also hits Lucario and opposing Tyranitar for super effective damage. Ice Punch is a viable alternative to Earthquake if none of these threats are an issue, as it allows for Tyranitar to deal heavy damage to Landorus-T, Gliscor, and Garchomp. Fire Punch is also an option to KO Ferrothorn and Scizor, but it doesn't supply Tyranitar with as much useful coverage as Earthquake or Ice Punch, because Stone Edge and Crunch hit both of these Pokemon hard enough anyway.
Set Details
========
The Attack and Speed EVs ensure that Tyranitar hits as hard as possible, while outpacing Skarmory so it can 2HKO with Stone Edge before it can Roost off the damage. Everything else is dumped into its HP stat so it remains as bulky as possible.
Usage Tips
========
Choice Band Tyranitar is meant to function as a powerful wallbreaker that should be used on teams in need of something to soften up walls such as Skarmory, Ferrothorn, and Gourgeist. This makes it a lot easier for a teammate to sweep or clean up once its counters are heavily weakened by Tyranitar. Tyranitar's insane bulk makes it more than capable of switching into a plethora of non-super effective special attacks, which can consistently put a lot of pressure on offensive teams that lack a good switch-in. Take caution when locking yourself into Crunch or Pursuit, because Lucario and Terrakion are very dangerous, and letting them get a free turn of set(remove space)up or a Justified boost can potentially lose you the battle. Overall, this set does not function very well( on) fast(hyphen)paced offensive teams because of how vulnerable it is once it's locked into a move due to its common exploitable weaknesses. It's a better fit on bulky offensive teams that need a wallbreaker to break down common defensive cores.
Team Options
========
Fighting-type Pok(é)mon(remove comma) such as Conkeldurr, Keldeo, and Terrakion(remove comma) completely destroy Tyranitar, as they resist both of its STAB moves. [i wouldn't go this far...each of these take ~half from Stone Edge, so they can't switch in more than once] Breloom is a great check to both Terrakion and Keldeo, [breloom, a great check? it can revenge kill with priority, that's about it -- your latios example is way better] while Latios resists their Fighting-type attacks and threatens them with Psyshock. This Tyranitar also pairs well with offensive partners that appreciate their counters heavily weakened. Mega Scizor has a lot of trouble breaking through Skarmory, Landorus-T, and Gourgeist, but Tyranitar can soften them up to a point where it can sweep afterwards. Talonflame can check Fighting-types( and) also enjoys( having) physically defensive Pok(é)mon heavily weakened. Sand Rush Excadrill benefits from Tyranitar's Sand Stream ability and can also clear entry hazards off the field with Rapid Spin, which greatly improves Tyranitar's longevity.
Other Options
########
Tyranitar is a very versatile Pok(é)mon, so it has plenty of other options to choose from. A specially defensive set can be used if you want Tyranitar to function as more of a special sponge, but it's not recommended because Tyranitar will primarily want to check physical attackers. [exactly how true is this? it's the best latios/latias counter in the tier] A lead Focus Sash attacker set with Fire Blast and Ice Beam can be a great lure to most physical walls such as Skarmory and Landorus-T, but it loses out on a lot of utility. [mention stealth rock for this set] A Curse set might seem viable because of Tyranitar's impressive defenses, especially in its Mega Evolution, but it's still very prone to being worn down quickly due to its exploitable weaknesses and lack of reliable recovery, [mention it's crappy speed here] so it's mostly overshadowed by the Dragon Dance set. Roar and Dragon Tail can phaze out sweepers that might try to set up on it(remove comma) as well as wear down the opposing team with entry hazard support. Thunder Wave can cripple Tyranitar's common switch-ins such as Lucario, Terrakion, and Keldeo. RestTalk is a much more viable strategy in XY due to the return of the old sleep mechanics, but it can't really fit the move combination anywhere without giving up a lot of coverage or utility. Aqua Tail hits Hippowdon harder than any other move in its arsenal, but it's better off running an Ice-type attack to beat Gliscor, Landorus-T, and Garchomp.
Checks & Counters
########
**Physically Defensive Walls**: Pok(é)mon with very high Defense have little trouble dealing with most of Tyranitar's sets. Hippowdon is the best full stop to Tyranitar in OU because of its access to reliable recovery, enormous physical bulk, and Ground-type, which allows it to easily switch into Stone Edge and Crunch with ease. Landorus-T and Gliscor are also fantastic checks to Tyranitar, [not really so fantastic when dd w/ ice punch is one of if not the most common set] fearing only a boosted Ice Punch from Mega Tyranitar and the stray Ice Beam. Skarmory fears very little from Tyranitar ats thanks to its access to Roost and high Defense stat. [can't switch into cb stone edge, and has to watch out for the random fire blast] Ferrothorn resists Stone Edge, takes little from Crunch, and threatens to deal heavy damage with Gyro Ball. Chesnaught resists both of Tyranitar's STAB moves and can set up entry hazards all over it. [is setting up entry hazards really the most relevant thing it can do against ttar? more like, stall with leech seed or ko with hammer arm]
**Fighting- and Ground-types**: Because of Tyranitar's crippling 4x weakness to Fighting-type attacks, Fighting-types are obviously some of the best checks to it in the game. Terrakion and Lucario can both receive an Attack boost with their Justified ability if they happen to switch into a Dark-type move. Keldeo(remove space), Breloom, and Conkeldurr also fear little from Tyranitar and can easily OHKO it. Diggersby, Garchomp, and Landorus are also great checks to Tyranitar with their powerful Ground-type attacks. [mention that garchomp, if is not carrying a life orb, does not even ohko mega tyranitar after stealth rock damage -- so, scarfchomp can't revenge kill it if it's high on health -- also phys def tar can just take around half from eq and kill it if it's lost ~20% with ice beam]
**Steel- and Fairy-types**: Scizor is a fantastic check because of its priority Bullet Punch. Both of Excadrill's STAB moves threaten to deal serious damage to Tyranitar. Mega Mawile resists both of its STAB moves and can easily OHKO back with Play Rough. [it does take a hell of a lot from eq, though] Azumarill can also destroy Tyranitar with Play Rough(remove comma) as well as pick off weakened Dragon Dance variants with Aqua Jet. Unaware Clefable can stop Mega Tyranitar short of a sweep, absorbing any attack with its great physical bulk and access to reliable recovery(remove: makes it very difficult to take down). [stone edge does 2hko with sr + 1 layer of spikes, though, so clefable isn't exactly switching in for free if mega tar is paired with deo-d to stack hazards, which is common]
**Politoed**: Politoed on its own is a huge threat to Tyranitar because of its Drizzle ability. This not only cancels out Tyranitar's Sand Stream ability upon activation, but also allows Politoed to KO with its powerful Water-type attacks(remove comma) as they are unhindered by sand. On top of this, Politoed is usually paired with other Water-types such as Kingdra or Kabutops which also threaten Tyranitar.
