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if a protean user changes type but has their ability swapped mid battles do they revert to their original typing? because if not i can see this working in doubles.
Shedinja has to mimic reflect type and then become a psychic ghost
deoxys with max boosts mimics power trip and is skill swapped protean by a kecleon and becomes a dark type when using powertrip. then medicham skill swaps pure power onto it and the deoxys powertrips the shedinja