Rayquaza-Mega @ Flyinium Z  
Ability: Sniper  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Spacial Rend  
- Aeroblast  
- Tail Glow  
- Tailwind  

Xerneas @ Lum Berry  
Ability: Unaware  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Spectral Thief  
- Baton Pass  
- Roost  
- Lovely Kiss  

Registeel @ Safety Goggles  
Ability: Flash Fire  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- U-turn  
- Poison Fang  
- Milk Drink  
- Entrainment  

Gengar-Mega @ Spooky Plate  
Ability: Mold Breaker  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Stealth Rock  
- Focus Blast  
- Shell Smash  

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Haze  
- Recover  
- Core Enforcer  
- Defog  

Blissey @ Spooky Plate  
Ability: Imposter  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Whirlwind  
- Perish Song  
- Moongeist Beam  
- Baton Pass