Rain Sweeper (Beartic) @ Lum Berry / Leftovers / Life Orb
Ability: Swift Swim  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant / Jolly Nature  
- Swords Dance  
- Icicle Crash  
- Superpower  
- Shadow Claw / Substitute / Aqua Jet

Other Options
- Choice Band
- Expert Belt
- Night Slash
- Stone Edge