Horsea @ Mystic Water
Ability: Swift Swim  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 2 Atk / 30 SpA  
- Rain Dance  
- Hydro Pump  
- Ice Beam  
- Hidden Power Grass
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Optional Move(s): 
- Hidden Power Electric
Optional Item(s): 
- Leftovers
Optional Ability:  
- N/A
Optional EV/IV(s): 
- N/A