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Would something along the lines of holding a Berry in line with the Natural Gift types be more viable? It would prevent running an item, but I am unsure how interactions with Knock Off and Trick would work.
I could also see replacing the Ability slot, this would prevent immunity stacking with...
Immunity
Premise: Nicknaming a Pokémon a specific type grants you an immunity to this type.
From what I have seen, there hasn't been a concept similar to this before, sorry if there has and I just missed it.
Potential Bans/Threats:
Ubers remain banned.
Clauses: Smogon-wide clauses, Dynamax...