If I go through all the 3-stage families
>Ivysaur is a great design, but Venusaur is too, just a different purpose and intent.
>Clefairy is better than Clefable, no doubt, as is Graveller over Golem, which has a major design shift for no apparent reason.
>Haunter and Gengar are debatable, some love Haunter more, some love Gengar more. I like em both.
>Rhydon shits all over Rhyperior. As does Chansey over Blissey and Electabuzz and Magmar are better too. Honestly, only Magnezone was an improvement in the Gen 4 third-stage evos we got for Gen I pokemon.
>Dragonair beats Dragonite
None of the mid-stages in Gen II are better than final stages I think, though Bayleef is arguable.
>Dusclops beats Dusknoir for sure
>Staravia over emo Staraptor
>Tranquill is better than Unfeasant, but is still a boring piece of shit. As OP indicated, Sliggo beats Goodra, definitely, while in Gen VII Torracat stomps the shit out of Incineroar.