Deoxys-Speed @ Choice Scarf  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Fissure  
- Trick  
- Stealth Rock  
- Sing  

Mewtwo-Mega-Y @ Focus Sash  
Ability: Speed Boost  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Tail Glow  
- Photon Geyser  
- Moonblast  
- Spore  

Rayquaza-Mega @ Focus Sash  
Ability: Triage  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Tail Glow  
- Oblivion Wing  
- Moongeist Beam  
- Secret Sword  

Meloetta @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Defog  
- Spectral Thief  
- Shore Up  
- Magic Coat  

Slaking @ Lum Berry  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Extreme Evoboost  
- Extreme Speed  
- Sunsteel Strike  

Chansey (F) @ Shed Shell  
Ability: Innards Out  
EVs: 252 HP / 252 Atk  
Lonely Nature  
IVs: 0 Def / 0 SpA / 0 SpD / 0 Spe  
- Shore Up  
- Magic Coat  
- Whirlwind  
- Anchor Shot