Sylveon @ Custap Berry  
Ability: Pixilate  
Tera Type: Fairy  
EVs: 252 HP / 252 Def / 4 Spe  
Bold Nature  
IVs: 0 Atk  
- Hyper Beam  
- Hyper Voice  
- Fake Tears  
- Endure  

Urshifu @ Black Glasses  
Ability: Unseen Fist  
Tera Type: Fighting  
EVs: 160 HP / 72 Atk / 60 Def / 8 SpD / 208 Spe  
Jolly Nature  
- Wicked Blow  
- Close Combat  
- Sucker Punch  
- Bulk Up  

Gouging Fire @ Clear Amulet  
Ability: Protosynthesis  
Tera Type: Fire  
EVs: 252 Atk / 192 SpD / 64 Spe  
Adamant Nature  
- Raging Fury  
- Outrage  
- Sunny Day  
- Dragon Dance

Sylveon has max Defense to live Adamant Meowscarada Giga Impact.  Urshifu tanks Choice Scarf Cresselia Moonblast and the rest should beat Gouging Fire with Bulk Up into Wicked Blow into Sucker Punch, attack dump.  Gouging Fire has max Attack for the best odds into Manaphy, Speed for Ogerpon, rest in Special Defense.