Dunsparce, Farfetch'd, all of the other novelty Pokemon.
All gen 5 Pokemon............. that are obvious rip-offs of past Pokemon, most of them at least. (Plus Trubbish and Garbador.)
all the pokemon after the metal version (generation 2). I believe they don't even look like pokemon, just some part of a child's imagination. Lawn mower pokemon? seriously? whats next, a potato pokemon? Sure, most of them are not like this but there is just something missing in the pokemon in the later generations. This may be because I am an old time player of pokemon and just did not like the later versions. Eh, who knows.