I'm going to have to say none did. Yes, generation one had Pokemon like Seel, and Dewgong, and Krabby. Which were just a Seal, just a Dougong, and just a Crab, but simplicity was fine in these games because they were the first, and I can excuse that. Also, for as overloved, overdone, and overexposed the Kanto Pokemon are, they do still have their charms, in my opinion.
While Generation 2 was mostly a majority of new evolutions for old Pokemon, and some pretty good new Pokemon. With, I guess some outliers, I guess? I don't know, I liked the generation 2 roster, despite being so small.
And Generation 3 had some great Pokemon, mostly completely new ones and a lot of them, in my opinion, except for Volbeat and Illumise, were pretty distinct for me. Plus, Treecko is there, and I'm bias towards Hoenn, I guess.
Generation 4, though, I guess went... a little... overboard with "giving new evolutions to old Pokemon" as well as there being way too many legendary Pokemon. But, a lot of the new Pokemon in the Sinnoh games were just cool, in my opinion. Apart from Heatran, I don't think generation 4 had too many "bad Pokemon" in my opinion.
As much hate as Generation 5 gets, I'm one of the people who never understood the hate. Like, "oh mY GOD GAME fREak Is LAzy thERE'S a GARbaGE pokEMON and an ICe cREAM PokEMON. While I admit some Unova Pokemon were just it's animal...with powers (Lillipup and Pidove lines come to mind) I liked most of the gen 5 Pokedex, and never understood the hate.
Then, around generation 6, they started reducing the amount of new Pokemon we got. And while some Pokemon in Kalos were...weird (Binacle, Diggersby to name two) quality over quantity, to be honest. I also feel like Gens 7 & 8 were peak of Game Freak having Pokemon fit with the region they're in. Gen 9 is growing on me, but at first I thought, "these are the worst" now, I don't think so anymore, tbh.
tl;dr: none. All generations have their share of good and bad Pokemon and I appreciate the design thought behind all 1,008 creatures.