Metagross @ Metagrossite  
Ability: Clear Body  
EVs: 252 HP / 224 Def / 32 SpD  
Impish Nature  
- Thunder Punch  
- Ice Punch  
- Bulldoze / Rock Tomb / Substitute
- Iron Head / Meteor Mash

Medicham @ Medichamite  
Ability: Pure Power  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Fake Out  
- High Jump Kick  
- Zen Headbutt  
- Poison Jab  

Tyranitar @ Tyranitarite  
Ability: Unnerve  
EVs: 48 HP / 252 SpD / 208 Spe  
Jolly Nature  
- Rock Tomb / Dragon Dance
- Crunch  
- Taunt  
- Iron Head / Counter / Rock move if you're using DD