Tank (Regirock) @ Leftovers  
Ability: Regenerator  
EVs: 252 HP / 16 Def / 240 SpD  or 252 HP / 252 Def / 4 SpD
Impish Nature  
- Stealth Rock  
- Body Press  
- Curse / Protect / Toxic
- Rock Blast / Rock Slide / Protect