Corsola @ Leftovers  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 4 SpD or 252 HP / 4 Def / 252 SpD
Bold or Calm Nature  
IVs: 0 Atk  
- Stealth Rock  
- Recover  
- Toxic   
- Scald

Other options: Power Gem over Toxic (hits Swoobat, Mr. Mime-G, and Silvally-Ice