Garchomp-Mega @ Garchompite  
Ability: Rough Skin  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Swords Dance  
- Stomping Tantrum / Earthquake
- Stone Edge  
- Fire Fang / Stealth Rock

Tyranitar @ Choice Band  
Ability: Sand Stream  
EVs: 8 HP / 252 Atk / 44 SpD / 204 Spe  
Adamant Nature  
- Stone Edge  
- Crunch  
- Pursuit  
- Earthquake  

Or

Hippowdon @ Leftovers  
Ability: Sand Stream  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Stealth Rock  
- Earthquake  
- Slack Off  
- Whirlwind