Steelix @ Rocky Helmet
Ability: Sturdy 
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Earthquake  
- Heavy Slam  
- Stealth Rock  
- Toxic / Roar

Steelix @ Leftovers
Ability: Sturdy
EVs: 252 HP / 76 Atk / 180 SpD
Careful Nature
- Stealth Rock
- Heavy Slam
- Earthquake
- Toxic / Curse / Protect / Roar

Steelix @ Life Orb  
Ability: Sheer Force  
EVs: 236 HP / 252 SpA / 20 Spe  
Modest Nature  
IVs: 0 Atk   
- Earth Power 
- Flash Cannon  
- Dark Pulse
- Stealth Rock