Gyarados-Mega @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Brave Nature  
IVs: 0 Spe  
- Nuzzle  
- Stealth Rock  
- Defog  
- U-turn  

Steelix-Mega @ Darkinium Z  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Core Enforcer  
- Knock Off  
- Shore Up  
- Parting Shot  

Mewtwo-Mega-Y @ Choice Specs  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psycho Boost  
- Psystrike  
- Earth Power  
- Moongeist Beam  

Zekrom @ Draco Plate  
Ability: Galvanize  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naughty Nature  
- Extreme Speed  
- Boomburst  
- Judgment  
- Shell Smash  

Chansey @ Eviolite  
Ability: Imposter  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Whirlwind  
- Aromatherapy  
- Metal Burst  
- U-turn  

Aegislash @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Haze  
- Shore Up  
- Destiny Bond  
- U-turn