Might as well take a crack at this:
Favorite: Vespiquen. Not so much on a competetive level, but it is by far one of the best bugs in terms of apperances.
Least favorite: Nearly all non-fullly evolved bugs. Burmy in particular. It can do...
Favorite: Tyranitar all the way. One of the best pokemon IMO
Least favorite: I like most darks. Sableye, though...
Favorite: Rayquaza. Pretty much every dragon shares this grouping (Notably the somewhat hated flygon. I love it.).
Least favorite: Altaria. Seems a little too much of a flying type.
Favorite: Magnezone. Then again, I'm a steel type nerd.
Least favorite: Gonna have to say pacharisu, though this is shared by most small electric types.
Favorite: Lucario, machamp, and Haryama all very close here. Probably lucario.
Least favorite: Hitmonlee (for the eyes that pierce into your soul) and Brelloom (darn you spore)
Favorite: Magmortar. Besides the need of weight watchers, what's not to like about a flamethrower/bazooka on your arm?
Least favorite: Magcargo. No wonder snails hate salt from the ground.
Favorite: Togekiss. Another competetive standpoint pick, probably the best poke on my team
Least favorite: Farfetch'd. Shall we go into why?
Favorite: Rotom. Last I checked ghosts should posses things.
Least favorite: Shedninja. Sort of pointless.
Favorite: Ludicolo. It's unique from grass types and the water type cancels out my hatred of grass.
Least favorite: Venusaur. Never particularly fond of any grass type, but this is my least favorite by a long shot.
Favorite: Flygon or gliscor. Yes I'm driving home a point with all of the times I'm putting flygon.
Least favorite: Whiscash. Not my cup of tea if you ask me.
Favorite: Mamoswine. The dual threat of sheer power...and the ability to spread illness.
Least favorite: Glaile. Pointless pokemon if you ask me.
Favorite: Lickylicky. Somehow I can't stare at it without laughing. Porygon-Z a close second.
Least favorite: Dunsparse. Least favorite pokemon ever.
Favorite: Gengar. Only cool one to begin with.
Least favorite: Arbok. At least seviper looks cool.
Favorite: Jirachi. Another pick off of competetive liking.
Least favorite: Unknown. Fun concept, bad pokemon.
Favorite: Since I can't re-use tyranitar, Rampardos or Rhyperior.
Least favorite: Probopas. Mr. Potato Head, meet picaso. It's so ugly and deformed...
Favorite: Dear god, I love them all (well, most). Probably metagross out of the ones I havent chosen.
Least favorite: Mawile. I'll stick to Victribell when I need a fly trap.
Favorite: Milotic, Kingdra, and swampert. All cool pokemon.
Least favorite: Luvdisk. Stupid cupid, stop picking on poor pokemon as advertisment.
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