Aggron-Mega @ Aggronite  
Ability: Filter  
EVs: 248 HP / 56 Atk / 196 SpD / 8 Spe OR 248 HP / 252 Atk / 8 Spe
Careful Nature  
- Stealth Rock  
- Heavy Slam  
- Earthquake  

Viable other moves:
- Protect
- Ice Punch
- Fire Punch
- Toxic
- Rest 
- Curse
- Whirlpool