misaki (jumpluff) contribution:
Macho Brace
Macho Brace halves the Speed of the holder, something that may immediately appear disadvantageous; it does have its uses, however. It is very comparable to Iron Ball, which has the same effect, but also removes the Flying/Levitating effects from the holder.
Macho Brace makes for a good item to Trick, as it cripples essentially anything without risking passing on something useful, such as Choice Scarf. It also powers up Gyro Ball and is useful on some Pokémon in Trick Room, which otherwise risk being outsped. It also has an advantage over Iron Ball on Pokémon like Bronzong, as it does not remove their immunity to Ground-type moves, Arena Trap, and Spikes.
The most immediately obvious disadvantage is that it makes the holder incredibly slow, leaving them vulnerable; however, it only sees use on slow Pokémon such as Bronzong to begin with. Unfortunately, these Pokémon desperately miss Leftovers recovery, although they can potentially obtain some with Trick. Although Iron Ball is disadvantageous for the holder, its side effects are particularly problematic for the recipient when Tricked; Macho Brace only halves Speed, something that might not end up useful against slow sweepers/walls, anyway.
Pokémon with Gyro Ball, Trickers, or Trick Roomers are the only effective users of Macho Brace. Keep in mind though that the base power of Gyro Ball caps at 150 (excluding STAB), and these Pokémon are generally very slow anyway.
Soul Dew
Raises the Special Attack and Special Defense of both Latias and Latios by 50%.
Soul Dew is the preferred item where usable for both Latias and Latios (it is useless on other Pokémon). Both sport high special stats, and the boost enables them to specially wall or sweep with ease.
The stat boosts apply on the switch-in, so they can switch into almost any special attack and begin setting up Calm Minds. Latios is better off used as a bulky sweeper, with 110 base Spe and 130 base Special Attack. Latias is used more defensively in Ubers, so the Soul Dew can be used to take even Modest Specs Kyogre's Water Spout in the rain. Both get Recover, so while they set up, they can heal the damage incurred. Trick is also of little concern, as they are still usable, if less effective, without Soul Dew, and the item is useless on other Pokémon.
However, Soul Dew takes up a valuable moveslot, most often filled by Leftovers in Ubers; as the Latis get Recover, though, this shouldn't really be of much concern. Arguably the main disadvantage is that Soul Dew is banned in standard play, forcing Latias to resort to the much inferior Specs or Life Orb for offensive versions, and Leftovers for defensive.
When EVing the pair with Soul Dew taken into account, always ensure their unboosted Special Attack / Special Defense stats are even (unless they are maxed, in which case it hardly matters). This is because odd numbers, when multiplied, are rounded down for the purposes of calculating stats, so by adding 4 extra EVs you gain two points instead of one.
Thick Club
Doubles Cubone's and Marowak's Attack.
Thick Club is an excellent item, although it only has any use on Marowak, which has decent 80 base Attack, Rock Head Double-edge, and access to Swords Dance. The Attack boosts are independent of boosted stats as well, so a +6 Marowak will effectively reach +12.
Marowak does not need to resort to Choice items to hit hard, as holding Thick Club allows it to switch its moves as needed. Needing less Swords Dances to hit spectacular Attack scores is also an advantage, as Marowak will have little chance to set up. It is also not left entirely helpless if it loses its item to Trick or Knock Off, although it will be much less powerful, with no redeeming Speed or bulk.
However, Marowak is quite slow and has many weaknesses; considering these, its defenses, especially when uninvested in, are nothing to be proud of. This can be remedied by Trick Room, but Trick Room only lasts five turns, and anything which can survive its onslaught can at least cripple it. Without Leftovers, Substitute will wear it down fast, and it has no way of recovering damage taken. It is also vulnerable to status without Lum Berry.
Marowak, and therefore Thick Club, is only really viable under Trick Room, or when passed Speed. Paralysis support is also useful to clear the path for Marowak to actually get some hits in.
Rindo Berry
When this Pokemon is hit by a super effective Grass-type move, the damage is reduced by 50%. This item is consumed after use. If this item is recovered via Recycle, it can activate again.
Type-resist berries are used to allow a Pokémon to survive through a common weakness while it sets up or KOs in return. They are often used on leads to ensure an entry hazard, but they can be used as a niche item for walls such as Swampert, whose only weakness is Grass.
Rindo Berry is rarely seen, so the element of surprise will almost always ensure it accomplishes what the user sets out to do. This could be phazing something with Hidden Power Ice, or more directly striking back with Magic Coat for the KO; examples of attacks it can survive and deal enough damage back to kill include max Special Attack Grass Knot from Celebi and Life Orb Hidden Power Grass / Grass Knot from Heatran, Infernape, and Jolteon. With a decent amount of SpD investment, it can even survive Celebi's Leaf Storm, and only marginal EVs are required to survive Specs HP Grass from Heatran, Jolteon, and other similar Pokémon.
However, the defensive Pokémon that will be using it (Swampert) or offensive (in some cases, Manaphy) will have a hard time sacrificing their item slot for a single-use item; both want either Leftovers or, in Manaphy's situation, Life Orb. Swampert cannot switch in on any of these Grass-type moves as they will outspeed to hit again, and Rindo Berry will hardly protect the likes of Manaphy from Jolteon; while it can deal with walls well enough, it can't switch in on resisted hits as easily, as it will incur enough damage to keep it in KO range. After Swampert uses up its Rindo Berry, it will be left on low health, and it lacks reliable recovery. Many stronger attacks still OHKO it if it switches in on Spikes or is poisoned, so Rindo Berry Swampert is by no means very consistent without Special Defense.
There are few Pokémon which can make good use of this item, and the best two have been outlined above. Grass is not a common offensive type and there are not many Pokémon which really benefit from this Berry, but on the plus side many sweepers do spare a slot for Hidden Power Grass to defeat Swampert, from Zapdos to Celebi, and unprepared opponents can lose their momentum if taken by surprise. Rindo Berry Swampert also makes for a decent lead, as it beats Celebi and walls most other leads, bar Explosion.
Light Ball
Doubles Pikachu's Attack and Special Attack.
Light Ball is the item which makes Pikachu usable, boosting its pitiful offensive stats to impressive heights. Pikachu with 152 Attack EVs reaches 368 Attack, and the special sweeper (252 Spe) hits 398.
Light Ball gives Pikachu impressive offenses for a mixed sweeper, even when its EVs are split. In fact, Light Ball is the only item really usable on Pikachu in basically any tier, as it has hideous base stats in everything except Speed. It lacks the recoil of Life Orb, boosts both stats much more than Choice items would, and leaves it with the freedom to switch moves or use Encore/Substitute.
Unfortunately, Pikachu has decent Speed but not quite enough to pull off a sweep most of the time, something Light Ball cannot remedy. It is also useless without it, so Knock Off or Trick render it dead weight on any team with it.
It is also worth noting that while Pikachu hits very hard with Light Ball Volt Tackle in particular, the recoil will really hurt it. Pikachu can suicide attack Blissey, dying alongside it after Volt Tackling with it.
Liechi Berry
Liechi Berry is one of a variety of items known as "pinch berries". It provides a 50% boost in Attack at the end of a turn in which the Pokémon hits ≤ 25% HP. It is used most often on Substitute setup sweepers and Baton Passers. The game plan is generally to Substitute over and over again until the boost is activated; then, it is either Baton Passed to a recipient, along with (hopefully) a Substitute, or used to sweep.
Many Pokémon appreciate the boost in power, and Pokémon not carrying Attack-boosting moves that can instead increase their Speed can make particularly good use of it. Ideally, Substitute sweepers will have both a boost and a Substitute at the end of the process, giving them two shots to hit much more powerfully.
With the prevalence of priority attacks (e.g. Scizor's Bullet Punch and Lucario's ExtremeSpeed) in the metagame, however, the weakened Liechi sweeper may be picked off before it gets a chance to attack, making it relatively useless. The opponent may set up themselves while it Substitutes down, or bring in a phazer to remove the boosts. Liechi is single-use, and the user will be so weakened during activating it that it will be unlikely to come in again. Lastly, Liechi will only hit as hard as a Choice Bander, although with the ability to switch attacks.
When EVing a Pokémon designed to hold Liechi, consider making its HP even; although more often than not Sandstorm or entry hazards will interfere with this, it allows it to activate Liechi after three Substitutes instead of four, leaving it at 25% health instead of 1%.
Wacan Berry
When this Pokemon is hit by a super effective Electric-type move, the damage is reduced by 50%. This item is consumed after use. If this item is recovered via Recycle, it can activate again.
Type-resist berries are used to allow a Pokémon to survive through a common weakness while it sets up or KOs in return. Not many Pokémon have a 4x weakness to Electric that stops them cold, but Gyarados is one. It can use the free turn while the Electric attack is consumed to obtain another boost.
Wacan Berry is almost never seen, so the opponent will be taken surprise of and fail to play around it. It gives Gyarados a free turn, allowing it to boost its Attack and Speed to further heights. It also enables it to take on walls like Vaporeon better.
However, Gyarados with Wacan Berry suffers from several concerns. The first is that without Life Orb, its damage output often simply isn't high enough; +2 Adamant Gyarados does only 51.12% - 60.27% to 188 HP / 252 Defense Bold Vaporeon with Stone Edge, so it will fall afterwards. The second is that Wacan Berry is one-use, and even while holding it, after taking damage from Stealth Rock, Sandstorm, and other resisted hits while coming in, it will still be KO'd by many decently strong Electric attacks. The third is that Electric is not its only weakness, so it is still very vulnerable to Rock-type attacks, and any neutral hard-hitting attack, such as Celebi Grass Knots.
Wacan Berry should not be gratituously given to Pokémon. It could perhaps see niche use on Pokémon such as Mantine, but in the end, for walls, Leftovers will generally be a superior option.
Damp Rock
If the holder uses Rain Dance, then it will last for eight turns, instead of the usual five. This also works even after the holder switches out.
Damp Rock is a staple on Rain Dance teams,
commonly seen on their leads and often on the back-up Rain Dancers. It provides extra turns for the other teammates to set up and sweep, as five turns are often too short to accomplish much.
Damp Rock is one of the most useful tools available to Rain Dance teams, extending the duration of their rampage. Five turns (working out at three, counting the turn on which Rain Dance is used, and then the switch to the appropriate sweeper) aren't quite long enough, and switching becomes more frequent, to set up Rain Dance again. It provides three extra turns before Rain Dance must be used again.
On bulky leads such as Bronzong, Leftovers recovery will be sorely missed. On offensive Pokémon such as Ludicolo, the loss of Life Orb can be quite disappointing. On frail leads, the choice between Focus Sash and Damp Rock can be difficult. Without Sash, the lead may not survive faster / priority attacks to even set up Rain Dance, but with it, the turns will be almost worthless.
There are several ways to utilize the turns Damp Rock provides to maximize efficiency. One is Exploding or U-turning to dent the opponent and allow the Rain Dance users to come in unscathed. The second is placing it on a Pokémon which can take advantage of the rain itself, although this takes up both an item and a moveslot. Damp Rock can work on many types of leads, but be aware that frailer leads in particular may not survive without a Focus Sash.
thanks a million jumpluff :D
ill try to get my items as soon as possible (i thought i pmed them to twash but i think it didnt go through, so ill post it myself)