Standard Dark/Ghost (Regirock) @ Heavy-Duty Boots  
Ability: Clear Body  
Tera Type: Rock  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Spectral Thief  
- Foul Play  
- Shore Up  
- Spikes/Knock Off/Strength Sap/Parting Shot/Teleport/Glare/Rapid Spin  

Anti Fairy (Regirock) @ Heavy-Duty Boots  
Ability: Clear Body  
Tera Type: Rock  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Strength Sap  
- Will-O-Wisp/Lava Plume  
- Spikes/Knock Off  
- Shore Up  

Balance Pivot (Regirock) @ Leftovers  
Ability: Clear Body  
Tera Type: Rock  
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Gigaton Hammer  
- Roost/Spectral Thief  
- Teleport  
- Spectral Thief/Shore Up