Huntail @ Darkinium Z  
Ability: Water Veil  
EVs: 252 Atk / 8 SpA / 248 Spe
Naive Nature  
- Waterfall  
- Ice Beam  
- Sucker Punch  
- Shell Smash
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Optional Move(s): 
- Double-Edge
- Hydro Pump
- Hyper Beam
- Surf
Optional Item(s): 
- Life Orb
- Normalium Z
- Waterium Z
- White Herb
Optional Ability: 
- Swift Swim
Optional EV/IV(s): 
- 29 HP
- 252 Atk / 4 Def / 12 SpA / 240 Spe  (Naughty)
- 8 Atk / 252 SpA / 248 Spe  (Naive)