Frosmoth @ Black Sludge  
Ability: Shield Dust  
Tera Type: Dark / Ghost / Rock
EVs: 252 Spe  
Naive Nature  
IVs: 6 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Substitute  
- Defog  
- Tailwind  
- Imprison / Stun Spore / Protect

Frosmoth

Frosmoth is a niche supporter that is 4x weak to Stealth Rock and is reasonable Steel Beam fodder, thus being an option in Court Change teams. Frosmoth can use Defog itself, mainly to get rid of Sticky Web, but perhaps the most valuable thing it can do with Defog is shut others out of it with Imprison. Tailwind and Stun Spore provide speed control team support. Frosmoth's Shield Dust ability lets it ignore Nuzzle's otherwise guaranteed paralysis. Naive Black Sludge lets Frosmoth be OHKOed by Mew, Tinkaton, and Iron Treads Steel Beam. 6 HP IVs let Frosmoth's max. HP be divisible by 8 so this somewhat slow and passive Pokemon can KO itself as quickly as possible. Tera Dark lets Frosmoth ignore Pranksters, while Tera Ghost lets it escape trappers, and Tera Rock lets it be OHKOed by Electrode-H Chloroblast while remaining weak to Steel.

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