Seaking @ Mystic Water  
Ability: Swift Swim  
EVs: 4 Atk / 252 SpA / 252 Spe  
Mild Nature  
- Rain Dance  
- Hydro Pump  
- Megahorn  
- Hidden Power Grass / Ice Beam
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Optional Move(s): 
- Double-Edge
- Hidden Power Ghost
- Endure
- Agility
- Flail
Optional Item(s): 
- Leftovers
- Liechi Berry
- Choice Band
Optional Ability:  
- Water Veil
Optional EV/IV(s): 
- 252 Atk / 4 SpD / 252 Spe  (Adamant)