Im actually surprised nobody has said Electrivire yet....
Because electivire is awesome.
its the only 1st season evolution that doesn't look really fat.
it just looks like a much cooler version of electabuzz with two wires on its back.
Carnivine-its a carnivorous plant. It actually sounded cool, but meh, they had to make it look like that.
magmortar- from having a butthead to being really fat. Its even worse when its shiny.
tangrowth- just a fatter tangela.
loopunny- sleazy is all i can say.
lickylicky-lickitung was disgusting enough, we didn't need an even uglier version.
bronzor/bronzong- just a floating piece of bronze. and bronzong looks hideous.
chimchar line- monkeys on fire. can't get much more original than that.
bidoof line- ugly looking beavers. you see them everywhere.
kricketune- a bug with a mustache.
probopass- it looks like it has a mr. potato mustache. Not only that, but its almost equally ugly to nosepass. Just a bit less ugly though.
combee- honeycomb bees. It just looks stupid, it should be three pokemon if its three honeycombs.
cherubi- a cherry that has another cherry pokemon on it. 2 pokemon! gee, next you'll see a pokemon based off of a carrot.
and thats basically all.
The new pokemon were actually pretty awesome, especially croagunk. He just looks so sinister.