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either jynx or kadabra
former for obvious reasons making it hard to really do anything with and they just kinda have to pretend it doesn't exist these days
kadabra because of that one fucker that to this day has made it so there's no new cards with it in the TCG
only other pokemon I can think of that has issues like that to anywhere near the same level is porygon but those aren't related to its design
unless you just wanted which design I hate the most then it's probably ambipom