Mewtwo-Mega-Y @ Terrain Extender  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Taunt  
- Photon Geyser  
- Sticky Web  
- Stealth Rock  

Mewtwo-Mega-X @ Fairy Memory  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Jolly Nature  
- Photon Geyser  
- Multi-Attack  
- Bonemerang  
- Light That Burns the Sky  

Deoxys-Attack @ Focus Sash  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 SpA / 252 Spe  
Lonely Nature  
IVs: 0 Def / 0 SpD  
- Shell Smash  
- Photon Geyser  
- Mind Blown  
- Light of Ruin  

Solgaleo @ Solganium Z  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Shell Smash  
- Sunsteel Strike  
- Bonemerang  
- Light That Burns the Sky  

Gyarados-Mega @ Lum Berry  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Spectral Thief  
- Shell Smash  
- Power Trip  
- Sunsteel Strike  

Mewtwo-Mega-Y @ Choice Scarf  
Ability: Innards Out  
EVs: 252 HP / 252 Atk / 252 SpA / 252 Spe  
Hasty Nature  
IVs: 0 Def / 0 SpD  
- Photon Geyser  
- Light That Burns the Sky  
- Menacing Moonraze Maelstrom  
- Trick