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Like I have been saying since gen 4, I want the fossilmons to be things weirder and more obscure and not just dinosaurs, as I feel that "regular" Pokemon can just as easily be dinosaurs, and in fact I would like it if we got prehistoric-based, non-fossil Pokemon to open up creativity more and thus not have us limited to just a single pair, "stuck" with Rock type, most likely just dinosaurs.
Semi-rant aside, I nominate Opabinia and any one of the weirdos from the Permian
