Walrein @ Sitrus Berry  
Ability: Unburden  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Belly Drum  
- Liquidation  
- Earthquake  
- Icicle Spear  

Walrein @ Assault Vest  
Ability: Regenerator  
EVs: 248 HP / 8 Def / 252 SpD  
Sassy Nature  
IVs: 0 Atk  
- Ice Beam  
- Super Fang  
- Brine  
- Surf / Body Slam