These two get my vote not just for worst bugs, but also for laziest Pokemon designs of all time. Plusle/Minun then Ilumise/Volbeat are still kinda lazy but way better an effort than literal recolors.

>>714694354
I'd give the "worst mon in the series" title to either Flamigo, or to these two collectively for being the only recolor to ever count as two different Pokemon in the main games.