Deoxys-Attack @ Focus Sash  
Ability: Psychic Surge  
EVs: 248 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shell Smash  
- Photon Geyser  
- 10,000,000 Volt Thunderbolt  
- Moongeist Beam  

Alakazam-Mega @ Focus Sash  
Ability: Magic Guard  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Defog  
- U-turn  
- Menacing Moonraze Maelstrom  
- 10,000,000 Volt Thunderbolt  

Groudon-Primal @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Thousand Arrows  
- Sunsteel Strike  
- Trick  

Mewtwo-Mega-Y @ Choice Scarf  
Ability: Parental Bond  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
IVs: 0 Atk  
- Moongeist Beam  
- Photon Geyser  
- Sludge Wave  
- Secret Sword  

Mewtwo-Mega-Y @ Focus Sash  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- Light That Burns the Sky  
- Searing Sunraze Smash  
- Photon Geyser  
- Sunsteel Strike  

Gardevoir-Mega @ Focus Sash  
Ability: Magic Bounce  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
- Shell Smash  
- Photon Geyser  
- Moonblast  
- Thousand Arrows