Regirock @ Rocky Helmet  
Ability: Sturdy  
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Stealth Rock  
- Body Press  
- Stone Edge  
- Toxic  

Regice @ Heavy-Duty Boots  
Ability: Clear Body  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Ice Beam  
- Thunderbolt  
- Focus Blast  
- Rock Polish  

Registeel @ Leftovers  
Ability: Clear Body  
EVs: 248 HP / 96 Def / 164 SpD  
Careful Nature  
- Seismic Toss  
- Protect  
- Toxic  
- Rest  

Regidrago @ Choice Specs  
Ability: Dragon's Maw  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
- Draco Meteor  
- Dragon Energy  
- Dragon Pulse  
- Explosion  

Regieleki @ Choice Scarf  
Ability: Transistor  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Electro Ball  
- Volt Switch  
- Thunderbolt  
- Rapid Spin  

Regigigas @ Leftovers  
Ability: Slow Start  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Body Slam  
- Knock Off  
- Power-Up Punch  
- Substitute