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Quilladin is the absolutely worst Pokemon in existence. Not because it's necessarily the worst designed Pokemon (don't get me wrong--it's a real fucking stinker) but because it's a starter. This means that no matter how many years and generations we go, Quilladin will always be relevant by virtue of being one in the line of Grass starter Pokemon.
It doesn't help that it evolves into one of the worst final evolutions of any starter Pokemon yet (and I say this as a fan of Chesnaught).