Lead (Cloyster) @ Focus Sash  
Ability: Refrigerate  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Spikes / Toxic Spikes
- Rapid Spin  
- Explosion  
- Shell Smash / Icicle Crash / Liquidation

Pivot (Cloyster) @ Heavy-Duty Boots  
Ability: Regenerator  
EVs: 248 HP / 252 Def / 8 SpD  
Impish Nature  
- Rapid Spin  
- Spikes / Toxic Spikes 
- Teleport  
- Ice Shard / Icicle Crash / Liquidation