Hoopa-Unbound @ Assault Vest  
Ability: Magician  
Tera Type: Psychic  
EVs: 132 HP / 172 Def / 188 SpA / 16 Spe  
Modest Nature  
IVs: 0 Atk  
- Psychic  
- Dark Pulse  
- Focus Blast  
- Thunderbolt  

Corviknight @ Maranga Berry  
Ability: Pressure  
Tera Type: Flying  
EVs: 252 HP / 36 Def / 180 SpD / 40 Spe  
Careful Nature  
IVs: 0 Atk  
- Body Press  
- Iron Defense  
- Roost  
- Taunt  

Maushold-Four @ Wide Lens  
Ability: Technician  
Tera Type: Normal  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Population Bomb  
- Feint  
- Tickle  
- Encore  

Hoopa has bulk for Spatk Booster Bolt and Max Attack Metagross, some speed creep, rest in Spatk.  Corv speed creeps slow Metagross, Spdef for Specs Pult, rest in Defense.  Maushold is just max max lol, might put Substitute over Encore to help with Gouging Fire.