Mewtwo-Mega-X @ Choice Band  
Ability: Shadow Tag  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Drain Punch  
- Fusion Bolt  
- Sacred Fire  
- Precipice Blades  

Gardevoir-Mega @ Iron Plate  
Ability: Wonder Guard  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Judgment  
- Moonblast  
- Gastro Acid  

Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 4 Def  
Adamant Nature  
- Knock Off  
- Water Shuriken  
- Pursuit  
- Gastro Acid  

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Curse  
- Glare  
- Recover  
- Encore  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 252 SpA / 8 SpD  
Modest Nature  
IVs: 0 Atk  
- Moonblast  
- King's Shield  
- Stealth Rock  
- Wish  

Scizor-Mega @ Safety Goggles  
Ability: Wonder Guard  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Aromatherapy  
- Recover  
- Defog  
- Baton Pass