Goodra-Hisui @ Custap Berry  
Ability: Sap Sipper  
Tera Type: Steel  
EVs: 248 HP / 212 SpA / 24 SpD / 24 Spe  
Calm Nature  
IVs: 0 Atk  
- Draco Meteor  
- Ice Beam  
- Acid Spray  
- Endure  

Volcanion @ Clear Amulet  
Ability: Water Absorb  
Tera Type: Fire  
EVs: 252 SpA / 92 SpD / 164 Spe  
Rash Nature  
- Overheat  
- Steam Eruption  
- Flame Charge  
- Taunt  

Regidrago @ Choice Band  
Ability: Dragon's Maw  
Tera Type: Dragon  
EVs: 136 HP / 120 Atk / 252 Def  
Impish Nature  
- Outrage  
- Scale Shot  
- Earthquake  
- Hammer Arm  

Goodra has spdef for Prim, some speed creep, rest in Spatk.  Volcanion has speed for Iron Crown after Flame Charge, max Spatk, rest in spdef with a non -attack nature for the best flame charge into overheat rolls on Iron Crown.  Regidrago lives any Ursaluna hit, rest in Attack.