Alakazam-Mega @ Terrain Extender  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Timid Nature  
- Light That Burns the Sky  
- Volt Switch  
- Menacing Moonraze Maelstrom  
- Photon Geyser  

Sceptile-Mega @ Focus Sash  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Spectral Thief  
- Nuzzle  
- Defog  
- Baton Pass  

Lopunny-Mega (M) @ Focus Sash  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Close Combat  
- Sunsteel Strike  
- Extreme Evoboost  
- Double Hit  

Groudon-Primal @ Choice Scarf  
Ability: Parental Bond  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- V-create  
- Sunsteel Strike  
- Power Whip  
- Ice Hammer  

Mewtwo-Mega-X @ Choice Scarf  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Light That Burns the Sky  
- Photon Geyser  
- Trick  
- Searing Sunraze Smash  

Blissey (F) @ Choice Scarf  
Ability: Innards Out  
EVs: 252 HP / 252 SpD / 252 Spe  
Gentle Nature  
IVs: 0 Atk / 0 Def  
- Trick  
- Whirlwind  
- Recover  
- Stealth Rock