Annoyer A Pokémon designed with the sole purpose of annoying the opponent and making it difficult for him/her to use a move. These Pokémon are also known as Paraflinchers. Moves for this purpose include Confuse Ray, Thunder Wave, Protect and Attract. It should be noted that the use of Annoyers has fallen since the start of Generation III, mostly due to the fact that they rely too much on luck.
Two relatively common Annoyers in Generation IV are Jirachi (with Serene Grace, Iron Head, Zen Headbutt and Thunder Wave) and Togekiss (with Serene Grace, Air Slash and Thunder Wave).
There are also parafusers, with the most popular of them being Rotom. They also rely on Thunder Wave, but instead of having Serene Grace they inflict confusion.
Anti-Leads Anti-Leads are Pokémon that are used to counter common Leads. These Pokémon may be carrying a Choice Scarf to outspeed the opposing expected lead and then carry a super-effective attack. An example of a Pokémon like this is Weavile; it is fast, it can taunt to prevent hazards and it can also use a combination of Focus Sash and Counter to KO opposing leads. Gengar is another example of this, holding a Focus Sash with Counter, Destiny Bond, Hypnosis and other moves to disable Pokémon. Forretress can also be considered an anti-lead, as it commonly carries Gyro Ball which is super-effective on leads such as Weavile and Aerodactyl. It can also deal with hazards set up by Aerodactyl with Rapid Spin and can also break Focus Sashes with this move.
Baton Passer A Pokémon with Baton Pass and at least one stat-boosting move such as Swords Dance or Agility, or Psych Up, Mean Look or Substitute. Raises one or more stats and/or activates one or more of the above moves, then Baton Passes the effects to another Pokémon in the party. Stat boosts are countered by a Hazer or Pseudo-Hazer. A good example of a Baton Passer is Ninjask, who gains one level of Speed after each turn. A Baton Passer often abuses the move Protect and may use Swords Dance and/or Substitute as well. Ninjask commonly carries Substitute and a Liechi Berry so that it can Baton Pass four Speed Boosts, a Leichu boost, and possibly a few Swords Dance boosts or a Substitute. Baton Passers can counter Pseudo-Hazers by passing Ingrain, however only Smeargle can learn both of these moves through Sketch. Pseudo-Hazers that utilize Roar or Whirlwind can be evaded by Baton Passing to a Pokémon with Soundproof, however they also cannot receive maneuvers such as Heal Bell and Perish Song.
Choice User This subsection refers to Pokémon that have a hold item that affects in-battle move power or speed with the cost of being able to only use one move until a switch-out or in the event that Pokémon faints.
Cleric A Pokémon that utilizes Aromatherapy or Heal Bell to cure itself and its team members. Clerics are often partnered with Rest users or Pokémon with few means to heal themselves. However, Aromatherapy only appears in the movesets of a number of Grass-type Pokémon and the Blissey and Clefable families, and Heal Bell does not affect Pokémon with the ability Soundproof. Popular Clerics include Blissey, Clefable and Celebi.
Decoy Any Pokémon that is 'sacrificed' against a strong opponent. The aim is to weaken the opponent's Pokémon before the sacrificial Pokémon is knocked out, then switch to a stronger Pokémon, preferably one whose moveset has an advantage over the opponent. A Decoy is often used to switch to a different Pokémon without causing damage to the Pokémon one wants to battle by sacrificing the Decoy.
DDer Any Pokémon that makes use of Dragon Dance. Usually, a DDer is a fast physical Sweeper such as Gyarados, Kingdra or Salamence.
Endureversal A moveset designed to Endure down to one HP, then Reversal or Flail for massive damage, since Reversal and Flail have 200 base power at 1%-4% HP. The item held is often a Salac Berry or a Liechi Berry, tying in with the previous strategy. Popular Endureversal include Feraligatr, Heracross and Kabutops. This strategy is similar to the F.E.A.R strategy.
Hax Something that relies more on chance than reliability or strategy. Hax can be manipulated in many different ways, including the use of items such as Quick Claw, Focus Band, BrightPowder, the use of the ability Serene Grace and the use of moves such as Fissure or Sheer Cold. Critical hits and extra effects of attacks, such as Flamethrower burning the foe, are often considered Hax. One variation of Hax is a Parahax.
Hazer A Pokémon that has a moveset with Haze in it. Much like a Spiker, it can have any combination of moves along with Haze. Fast Pokémon and those with high defenses, such as Altaria and Articuno, make good Hazers.
Lead The starting Pokémon of a team. In general, these Pokémon do at least one of two things: set up hazards or prevent the opponent from setting up hazards. Examples of Pokémon that do both are Aerodactyl (with Taunt and Stealth Rock), Forretress (with Rapid Spin, Spikes, Stealth Rock and Toxic Spikes) and Tentacruel (with Rapid Spin and Toxic Spikes). An example of Pokémon that only set up hazards is Heatran (with Stealth Rock). An example of a lead that only prevents hazards is Weavile (with Taunt).
LumRest The use of the Lum Berry in combination with Harvest to use Rest and other moves, such as Petal Dance, without suffering the negative effect.
Pseudo Passer A moveset with Wish, Safeguard, Light Screen and/or Reflect in it. Reflect and Light Screen are countered by Brick Break.
Pseudo Hazer (PHazer)A moveset with either Whirlwind or Roar, which is intended to force a stat-boosted Pokémon out of the ring. A Shuffler can also be a PHazer. A moveset with a move like Yawn, Leech Seed, Perish Song or Charm can also be considered a PHazer. If the opponent decides not to switch out after being hit with one of these moves, he/she will have a hard time continuing the battle with their current Pokémon.
Rapid Spinner Also called Spinner. A user of the move Rapid Spin, which is used to remove entry hazards. Common Rapid Spinners are Starmie and Tentacruel
Revenge Killer A Pokémon that can switch in after an opponent has knocked out another Pokémon and knock out that opponent. Revenge Killers are often equipped with Priority Moves or a Choice Scarf. For example, Weavile makes an effective revenge killer due to its high Attack stat and access to Ice Shard.
Sashed A Pokémon that is holding a Focus Sash, usually a very frail one such as Dugtrio or Weavile, so it can survive a hit.
Shuffler (Parashuffler/Pyroshuffler/Toxishuffler)A moveset with either Roar or Whirlwind and Toxic as well as Thunder Wave or Will-O-Wisp. Works by inflicting a status condition, then PHazing and repeating. Often used in tandem with a Spiker for best results. Countered by a Cleric, or simply by attacking each time they try to PHaze.
Sleep Talker (Restalker/STalker)A moveset with Rest and Sleep Talk. It is used to maintain a Pokémon's (usually with good defenses) health with Rest, but allow it to attack in the meantime with Sleep Talk. It's not a perfect strategy, as there is the chance Sleep Talk will call Rest again, but it works often enough to see use. Milotic is an excellent example of a Sleep Talker due to Marvel Scale. Though Milotic also has Recover, the Sleep Talker set is sometimes used because of its ability, though generally, moves such as Recover are better.
Spiker A moveset that includes the move Spikes. Since that is the only requirement, there are many variations to Spiker movesets. Effective ones utilize Roar or Whirlwind, Toxic Spikes, Stealth Rock, and/or Rapid Spin.
Spinblocker A Ghost-type Pokémon that is used in order to stop the foe from using Rapid Spin (which doesn't affect Ghost-type Pokémon) to remove entry hazards from its side of the field. Notable Spinblockers are Froslass and Giratina
Staller Much like the Tank, this moveset lives to build up passive damage (such as Poison, Burn, Leech Seed, and weather conditions) while stalling with Protect, recovery moves or (rarely) with Fly, Dive or Dig. Toxic is most commonly used due to its increasing amount of damage caused. Some counters include a Cleric, the move Taunt and Clefable (due to the ability Magic Guard).
Sweeper A moveset designed with the object of quickly knocking out, or "sweeping," an opponent's team. Sweepers specialize in primarily direct attacks, often with stat-boosting moves. Sweepers are characterized by high Speed and offensive stats, while often having poor defensive stats and HP. There are three types of sweeper—Physical, Special and Mixed: Physical sweepers use physical moves, Special sweepers use special moves, and Mixed sweepers use both. Mixed sweepers can also be used as wall breakers, which are mixed Sweepers whose attacks are specifically chosen to take down common walls, like Close Combat for Blissey or Fire Blast for Skarmory. Common counters are bulky Pokémon and priority moves.
Tank A Pokémon that can take hits and still fight back. Often functions as a Wall but different because while being hard to KO, it can still threaten the opponent offensively. Some common Tanks are Bronzong and Suicune.
Trapper A set designed with the purpose of trapping a Pokémon for one reason or another. Moves such as Mean Look and Spider Web are standard trapping moves but moves such as Wrap and Fire Spin are also used sometimes. May be used in tandem with Toxic or Curse (Ghost version) to sap the opponent's health or Perish Song for a guaranteed knockout. Certain abilities, such as Shadow Tag, Magnet Pull and Arena Trap, trap automatically.
Trickbander A moveset that employs Trick and the held item Choice Band to incapacitate any opponent that doesn't use Physical attacks (most likely a Tank, Annoyer or Special Sweeper). Trick switches items with the opponent, so that they lose their valuable held item and get a restrictive one. In Generation IV, with the introduction of Choice Specs and Choice Scarf, the more common item to switch onto the opponent is Choice Scarf because the receiver gains no offensive boost and the user makes use of the speed boost to Trick before the opponent makes their move.
Trickbracer Similar to the Trickbander, a Trickbracer gives the opponent the Macho Brace instead - an item that reduces Speed. It will stop most Sweepers in their tracks due to the reduction of their Speed that is so crucial. In Generation IV, the Iron Ball and Lagging Tail hold items exist almost solely to be used in this way, while the Klutz ability seems to exist so that the Pokémon using Trick doesn't have to suffer the effects of the item they are Tricking to the opponent.
Wall A Pokémon with a very high defensive stat. Used to block attacks of that kind (for example, a Physical Wall would block Physical attacks).
http://bulbapedia.bulbagarden.net/wiki/Appendix:Metagame_terminology
