Serperior @ Lum Berry  
Ability: Contrary  
Tera Type: Grass  
EVs: 184 HP / 72 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Leaf Storm  
- Leech Seed  
- Substitute  
- Protect  

Ursaluna @ Assault Vest  
Ability: Guts  
Tera Type: Ground  
EVs: 152 HP / 180 Atk / 4 Def / 156 SpD / 16 Spe  
Adamant Nature  
- Giga Impact  
- Headlong Rush  
- Avalanche  
- Gunk Shot

Iron Hands @ Booster Energy  
Ability: Quark Drive  
Tera Type: Fighting  
EVs: 116 HP / 252 Atk / 140 Spe  
Adamant Nature  
- Close Combat  
- Supercell Slam  
- Heavy Slam  
- Low Sweep  

Serp tanks offensive Pecharunt, rest in Defense, Ursaluna is da standard one, Iron Hands outspeeds Corv after Low Sweep, max Attack, rest in HP.