Special wallbreaker (Octillery) @ Choice Specs  
Ability: Primordial Sea  
EVs: 4 HP / 252 SpA / 252 Spe  or 252 HP / 252 SpA / 4 SpD Quiet Nature 0 Spe IV
Modest / Jolly Nature  
IVs: 0 Atk  
- Water Spout  
- Ice Beam  
- Energy Ball  
- Hydro Pump