Dugtrio @ Leftovers  
Ability: Sand Force  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Protect / Substitute
- Toxic  
- Earthquake  
- Stone Edge  

Dugtrio @ Focus Sash  
Ability: Sand Force  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Stealth Rock  
- Memento  
- Earthquake  
- Stone Edge  

Other options: Life Orb with Sludge Wave and Shadow Claw or Sucker Punch, Soft Sand, Choice Band