Froslass @ Black Sludge  
Ability: Snow Cloak  
Tera Type: Dark  
EVs: 252 Spe  
Naive Nature  
IVs: 6 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Substitute  
- Taunt  
- Imprison  
- Thunder Wave  

Froslass @ Sitrus Berry / Pecha Berry
Ability: Snow Cloak  
Tera Type: Dark  
EVs: 252 Spe  
Naive Nature  
IVs: 6 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Switcheroo  
- Substitute  
- Taunt  
- Imprison / Thunder Wave