Mewtwo-Mega-Y @ Choice Specs  
Ability: Psychic Surge  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Blue Flare  
- Psycho Boost  
- Volt Switch  
- Sunsteel Strike  

Celebi @ Life Orb  
Ability: Sheer Force  
Shiny: Yes  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Seed Flare  
- Psychic  
- Earth Power  
- Shell Smash  

Celebi @ Leftovers  
Ability: Primordial Sea  
Shiny: Yes  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Defog  
- Scald  
- Shore Up  
- Baton Pass  

Celebi @ Leftovers  
Ability: Fur Coat  
Shiny: Yes  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
IVs: 0 Spe  
- Skill Swap  
- Stealth Rock  
- Roost  
- Spectral Thief  

Celebi @ Leftovers  
Ability: Thick Fat  
Shiny: Yes  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Leech Seed  
- King's Shield  
- Topsy-Turvy  
- Spore  

Regigigas @ Safety Goggles  
Ability: Rattled  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Baton Pass  
- Spore  
- Knock Off  
- Heal Order