Rayquaza-Mega @ Sky Plate  
Ability: Aerilate  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Sacred Fire  
- Stealth Rock  

Mewtwo-Mega-X @ Life Orb  
Ability: Turboblaze  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Knock Off  
- Shell Smash  
- Close Combat  
- Dark Void  

Mewtwo-Mega-Y @ Lum Berry  
Ability: No Guard  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Zap Cannon  
- Sheer Cold  
- Gastro Acid  
- Sing  

Chansey (F) @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 252 Def / 4 SpD / 4 Spe  
Bold Nature  
IVs: 0 Atk  
- Perish Song  
- Stealth Rock  
- Whirlwind
- Soft-Boiled  

Xerneas (F) @ Iron Plate  
Ability: Wonder Guard  
EVs: 176 HP / 252 SpA / 80 Spe  
Rash Nature  
- Freeze-Dry  
- Judgment  
- Thousand Arrows  
- Shell Smash  

Swampert-Mega (F) @ Safety Goggles  
Ability: Wonder Guard  
Shiny: Yes  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Whirlwind  
- Parting Shot  
- Spikes  
- Recover