Mewtwo-Mega-Y @ Choice Specs  
Ability: Tinted Lens  
Tera Type: Psychic  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Psystrike  
- Photon Geyser  
- Ice Beam  
- Fleur Cannon  

Necrozma-Dawn-Wings @ Ultranecrozium Z  
Ability: Simple  
Tera Type: Psychic  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
- No Retreat  
- Moongeist Beam  
- Photon Geyser  
- Ice Beam  

Gyarados @ Gyaradosite  
Ability: Simple  
Tera Type: Water  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- No Retreat  
- Power Trip  
- Fishious Rend  
- Disable  

Arceus-Fairy @ Pixie Plate  
Ability: Magic Bounce  
Tera Type: Fairy  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Take Heart  
- Shore Up  
- Judgment  
- Secret Sword  

Gengar-Mega @ Spooky Plate  
Ability: Magic Guard  
Tera Type: Ghost  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Toxic Spikes  
- Taunt  
- Judgment  
- Ice Beam  

Gengar-Mega @ Black Sludge  
Ability: Regenerator  
Tera Type: Ghost  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Trick  
- Substitute  
- Baton Pass  
- Moongeist Beam