Hydreigon @ Life Orb / Choice Specs
Ability: Sheer Force / Adaptability
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Fiery Wrath  
- Fire Blast  
- Knock Off / Draco Meteor / Earth Power / Roost
- Parting Shot / Draco Meteor

Hydreigon @ Assault Vest  
Ability: Regenerator  
EVs: 248 HP / 72 SpA / 96 SpD / 92 Spe  
Modest Nature  
- Draco Meteor  
- Fire Blast / Flamethrower / Flash Cannon
- Knock Off  
- U-turn