Oshawott @ Eviolite
Ability: Shell Armor
EVs: 252 SpA / 236 SpD
Mild Nature
- Aqua Jet
- Ice Beam
- Air Slash
- Hydro Pump / Scald
Aqua Jet is STAB priority. Ice Beam and Air Slash both cover Oshawott's Grass weakness, and are generally good moves anyways. Hydro Pump is more powerful, while Scald has a chance to burn your opponent, so whatever you choose.