I really used to like bulbasaur, but the dog ears killed it for me. Reptiles don't have external ears! This is also the reason why I don't like Reshiram, it's a big bipedal dog with what looks like a jet engine jammed up its arse. Not very dragon-y.
I also really used to like scolipede, but now I find it looks too caterpillar-ish, like it should evolve still. Now that I think of it, I think I liked the moveset scolipede had more than the actual design itself.
I also used to like the sandile line, 'til the one I had got to Krookodile with its dick nose.
On the flip side, I did not like scraggy/scrafty before but they are growing on me now.
I also wasn't keen on piplup, but empoleon singlehandedly redeems that line.