Kyogre-Primal @ Power Herb  
Ability: Liquid Voice  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Boomburst  
- Freeze-Dry  
- Geomancy  
- Core Enforcer  

Groudon-Primal @ Choice Scarf  
Ability: Desolate Land  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- V-create  
- Thousand Arrows  
- Sunsteel Strike  
- Spectral Thief  

Zygarde-Complete @ Safety Goggles  
Ability: Fur Coat  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Thousand Arrows  
- Shore Up  
- Topsy-Turvy  
- Stealth Rock  

Mewtwo-Mega-Y @ Terrain Extender  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psycho Boost  
- Psystrike  
- Volt Switch  
- Rapid Spin  

Gengar-Mega @ Spooky Plate  
Ability: Normalize  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Entrainment  
- Shell Smash  
- Judgment  
- Boomburst  

Diancie-Mega @ Life Orb  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Head Smash  
- Light of Ruin  
- Spectral Thief  
- Core Enforcer