Overview
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After dwelling in low the bottom of OU in BW2 OU for a long time, the Hydra-like pseudo-legendary Hydreigon has dropped to UU, where it has the chance to shine. It can utilize its amazing offensive stats and STAB moves to wreack wreak havoc, while it's its giant movepool takes care of its few would-be counters. The Dark buff to the Dark-type also helped immensely because now there are less resists Pokemon that resist to Hydreigon's STAB Dark-type moves STAB.
Not all is good for Hydreigon though. One of the reasons it dropped is because of The introduction of the new Fairy-type typing, something which Hydreigon happens to be 4x weak to,(AC) limits its capabilities,(AC) so now it has even more weaknesses besides the common attacking types Fighting and Bug. It's Its Speed can sometimes also be underwhelming, being outspeed outsped by the base 100s and higher speed tier mons many faster Pokemon that can easily kill it like KO it such as Mienshao and Infernape. However, if you play Hydreigon to it's its strengths, it can be one of the deadliest Pokemon in the tier.
Specially based Life Orb
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name: Specially based Life Orb
move 1: Draco Meteor
move 2: Dark Pulse
move 3: Iron Tail / Roost
move 4: Superpower / Roost
ability: Levitate
item: Life Orb
evs: 56 Atk / 200 SpA / 252 Spe
nature: Naive / Hasty
Moves
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Slap a Life Orb on Hydreigon, and Draco Meteor becomes a nuke that will decimate everything that's not a Fairy-type,(AC) a Steel-type,(AC) or a Blissey. Dark Pulse hits Jirachi if it wants to switch into a Draco Meteor and it does a good chunk to Mega Aggron as well. Iron Tail and Superpower are coverage moves to hit Fairies and Blissey respectively. Roost is an alternative if you want Hydreigon to have recovery, and don't need the coverage move as much because you have the threats covered.
Set Details
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The Attack EVs should only be used if you're using Hydreigon is running Superpower so you it can 2HKO Blissey after rocks Stealth Rock damage, but if you're it's not using Superpower feel free to shove them into Special Attack. Maximum Speed investment with a Naive nature just to be able allows Hydreigon to outspeed Haxorus before a boost, and the rest of the EVs are pumped in Special Attack to hit as hard as possible with the dual STABs its STAB moves. A Hasty nature can be an alternative used if you want to allow Hydreigon to take special hits slightly better, but Naive is preferred for taking priority moves.
Usage Tips
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This Hydreigon set excels at punching holes in the opposing team. It appreciates a U-turn or Volt Switch user that can safely bring it in to launch a big hit, and a pivot you such as Jirachi it can fall back to when Hydreigon it is forced out like Jirachi. This set is usually best used on more offensive teams, because it provides a lot of important resistances as an offensive mon like Pokemon such as Psychic, Dark, Fire, Electric,(AC) and Water. Most of the time you it will be spamming Draco Meteors, but if your the opponent has a solid counter to the Scarf set that most people expect like Blissey or Togekiss, try not to reveal your the item and lure them out so you Hydreigon can hit them hard with Superpower or Iron Tail respectively.
Team Options
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Jirachi is a good partner as it can bring in Hydreigon safely with a U-turn and it can beat the Fairies he it struggles against. Victini can beat his Hydreigon's enemies and pivot with U-turn as well, but unlike Jirachi it can switch into Fighting-type moves. Togekiss switches into Bug-, Fighting-,(AC) and Dragon-type moves and can use a slow Baton Pass to bring Hydreigon in.
Choice Scarf
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name: Choiced Choice Scarf
move 1: Draco Meteor
move 2: Dark Pulse
move 3: Fire Blast / Dragon Pulse
move 4: U-turn
ability: Levitate
item: Choice Scarf
evs: 252 SpA / 4 SpD / 252 Spe
nature: Timid / Modest
Moves
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Choice Scarf Hydreigon is unfortunately hurt a lot by the arrival of the new Fairies, but that doesn't mean that it's no longer viable. It still has a powerful STAB Draco Meteor coming from a base 125 spatk Special Attack, and which it allows it to revenge kill a variety of threats. Dark Pulse is a secondary STAB that is more reliable and hits Psychics Psychic-types. Fire Blast is the preferred option in the 3rd third slot to hit Lucario and other steels Steel-types, but Dragon Pulse is a more reliable secondary Dragon-type STAB move. U-turn is a very important move, as it allows Hydreigon to gain momentum when special walls and Fairies switch in.
Set Details
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The spread is standard for a special sweeping scarfer Choice Scarf user; just simple maximum Speed and max Special Attacks investment. Timid is the preferred nature because you want to outspeed as many things Pokemon as possible and Speed tie with opposing Scarf Hydreigon. Modest gives you Hydreigon a nice power boost to your power and allows you for example to kill it to KO Nidoking after one round SR Stealth Rock damage.
Usage Tips
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Scarf Hydreigon can be used on any type of team as a revenge killer because of it's its great typing,(AC) both offensively and defensively. There is honestly no drawback to using it on your team. Early-game you usually it should be used to scout and wear down the opposing team by U-turning with U-turn while and dropping a Draco Meteor or two, but late-game Hydreigon shines late-type by cleaning a worn-down team with its powerful dual STABs moves.
Team Options
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Hydreigon is the easiest mon Pokemon to make a U-turn core with, so Crobat, Jirachi,(AC) and Victini all work. They also help Hydreigon take out Fairies which completely wall it. Although Fairies are Hydreigon's biggest enemy, they are also great partners. They resist his Dragon, Bug,(AC) and Fighting weakness so you it wont doesn't have to worry about opposing Hydreigon, faster U-turners users,(AC) and Scarf Mienshao. Froslass, Roserade,(AC) and Nidoqueen are useful for setting up hazards that weaken the opposing team enough so Hydra Hydreigon can get the kills KOs much more easily.
Other Options
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Hydreigon can utilize Choice Specs to make the most of its great Special Attack stat, but being locked into Dragon- and Dark-type moves isn't the greatest thing in a meta where Fairies run rampant. With the combination of Scope Lens and Focus Energy, Hydreigon can use a similar set to the famous Critdra. It can opt for some interesting support moves like such as Toxic, Taunt, Tailwind,(AC) and Thunder Wave, but you're it's usually better off using strong attacks. Choice Band Hydreigon can catch it's its usual counters off-guard by hitting super hard on the physical side.
Checks & Counters
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**Fairy-types**: Togekiss, Florges, Granbull,(AC) and Aromatisse can all switch into Hydreigon's STAB moves with their excellent bulk. Especially Granbull is nice for countering Hydreigon as it can use it's Intimidate to weaken Iron Tail from the mixed set.
**Fighting-types**: Mienshao equipped with a Choice Scarf Mienshao can revenge kill any kind of Hydreigon. Machamp with an Assault Vest Machamp can switch into Scarf Hydra Hydreigon and hit it with a Dynamic Punch, while Lucario can switch once into a scarfed Draco Meteor or Dark Pulse once and set up or hit something with a use Close Combat.
**Special Walls: Blissey and Umbreon easily wall the Choice Scarf set because of their high Special Defense and HP stat. They have to be careful around the mixed set though, as one well-timed Superpower could spell doom for them.
