I need to get the consensus of the community to see which are the top worst and most hated pokemon in each of these gens.

I want to do a challenge run using the worst or the worst on each legacy gen.

EDIT: I appreciate the suggestions so far. Definitely keep them coming. What I am looking for in each suggestion is a pokemon that all around is terrible (BST, evolutions, movepool, etc), even in the legacy renditions. Some of the suggestions have been based on how creepy/unsettling the pokemon is, which is fine but ultimately not relevant in the playthrough.

EDIT 2: I have assembled the final team. Seaking, Ditto, Electrode, Farfetchd, Lickitung, Parasect.

I will be doing a post soon on how my run went