Gen 4 PU
Huntail @ Focus Sash
Ability: Swift Swim
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Crunch / Sucker Punch
- Waterfall / Aqua Tail
- Body Slam / Return / Super Fang
- Ice Fang / Toxic
Waterfall is reliable STAB. Aqua Tail is more powerful, but it's also more inaccurate. Crunch is coverage. Sucker Punch can be used for priority, but it's weaker and needs proper prediction. Body Slam is strong neutral coverage with a chance to paralyze, Return opts for more damage over paralysis, and Super Fang can easily cut an opponent down to half health. Ice Fang covers Huntail's weakness to Grass, while Toxic can be used instead if you want to take out more defensive Pokemon.