Favorites:
Blitzel- I always wanted a zebra Pokemon after gen 1, and I wasn't dissapointed
Liepard- I love the sleakness. It looks like a predator ready to pounce and the colors mix nicely
Herdier- I like it's evos too, but Herdier is a great looking dog Pokemon.
Sewaddle- Probably the cutest bug Pokemon ever. Good evos too
Scolipede- Vicious and intimidating. Good prevos also
Lilligant- For a humanoid flower Pokemon, Lilligent's design is actually very pretty
Sandile and evos- This whole line is awesome
Scraggy- It grew on me over time
Cofagrigus- I love the coffin concept. Cofagrigus looks very intimidating
Garbador- Yeah that's right. I like Garbador. I think it's awesome
Deerling & Sawsbuck- Awesome concept
Tynamo and evos- Another awesome design. Eelectross is scary as hell
Haxaros- Ax face. Total badass
Golurk- Giant golum. Complete badass
Hydreigon- I know some people hate it, but I think it's the most evil looking Pokemon ever
Volcarona- Absolutely beautiful
Zekrom, Reshiram, and normal Kyurem- 3 totally badass dragons

Least favorites
Wise Monkeys- I just don't see why there had to be 6 of them. Their 2nd stages all look too goofy to me.
Roggenrola- I like it's evos, but Roggenrola I don't get. It's lack of face scares me
Excadrill- I like Drillbur, but Excadrill's head drill is way over the top
Palpitoad & Seismitoad- Just ugly. I like it's 1st stage, shame it didn't work out
Crustle- Dwebble is cool, but Crustle's back looks like such a hindrance
Gothitelle- I like it's prevos, but Gothitelle just looks ridiculous, especially it's stubby legs
Bisharp- One of the few Pokemon I'd consider close to Digimon looking.

I don't hate any of the ones I dislike, they're just not my favorites. What about you /vp/?