Ditto @ Sticky Barb  
Ability: Imposter  
Tera Type: Ice  
EVs: 252 Spe  
Naive Nature  
IVs: 2 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Transform

Ditto

With Imposter, Ditto can scout opposing Pokemon for unusual moves, especially Trick, Switcheroo, and Knock Off, and transform into often frailer versions of them. However, being stuck in its base form against opposing Pokemon with Substitutes is a huge concern. Sticky Barb lets Ditto profitably transform into Poison-types, and a Naive nature lets Ditto be OHKOed by Orthworm Steel Beam. 2 HP IVs make Ditto's max. HP divisible by 8 so it can use self-2HKO sets profitably. Tera Ice makes Ditto even better Steel Beam fodder and makes it weak to Stealth Rock to boot.

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