Mewtwo-Mega-X @ Life Orb  
Ability: Arena Trap  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- Ice Beam  
- Vacuum Wave  
- First Impression  
- Menacing Moonraze Maelstrom  

Gyarados-Mega @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Destiny Bond  
- Spore  
- Spectral Thief  
- U-turn  

Blissey (F) @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Heal Bell  
- Whirlwind  
- Trick  
- Shore Up  

Mewtwo-Mega-Y @ Lum Berry  
Ability: Innards Out  
EVs: 252 HP / 252 SpA / 252 Spe  
Hasty Nature  
IVs: 0 Def / 0 SpD  
- Spikes  
- Photon Geyser  
- Magic Coat  
- Spore  

Gengar-Mega @ Choice Scarf  
Ability: Parental Bond  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Moongeist Beam  
- Trick  
- Spore  
- Shell Smash  

Kartana @ Fire Memory  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Shell Smash  
- Multi-Attack  
- Spore  
- Sunsteel Strike