Diancie-Mega @ Pixie Plate  
Ability: Pixilate  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Sacred Fire  
- Stealth Rock  

Gyarados @ Gyaradosite  
Ability: Wonder Guard  
EVs: 32 HP / 252 Atk / 224 Spe  
Adamant Nature  
- Shell Smash  
- Knock Off  
- Waterfall  
- Magic Coat  

Mewtwo-Mega-X @ Choice Scarf  
Ability: No Guard  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Sheer Cold  
- Trick  
- Sacred Fire  
- Gastro Acid  

Xerneas @ Iron Plate  
Ability: Wonder Guard  
EVs: 176 HP / 252 SpA / 80 Spe  
Modest Nature  
- Shell Smash  
- Judgment  
- Thousand Arrows  
- Moonblast  

Steelix-Mega @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
- Gastro Acid  
- Destiny Bond  
- Recover  
- Thousand Arrows  

Yveltal @ Leftovers  
Ability: Magic Bounce  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
- Knock Off  
- Roost  
- Sucker Punch  
- Parting Shot