Use Regirock Instead (Skeledirge) @ Black Sludge  
Ability: Unaware  
Tera Type: Fire  
EVs: 248 HP / 8 Atk / 252 Def  
Impish Nature  
- Scald  
- Mortal Spin  
- Shore Up  
- Topsy-Turvy  

Unaware Setup (Use Anyone Else) (Skeledirge) @ Leftovers  
Ability: Blaze  
Tera Type: Fire  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Scald  
- Matcha Gotcha  
- Strength Sap  
- Calm Mind