I'm starting to dislike Charizard, Mewtwo and Lucario, if only because they're shoved in my face at every turn. Yeah, they all have neat designs, and they're pretty cool (heck, Mewtwo is even a cat, and I love cats) but really. Get some new poster childs, GF.
There are those few Pokemon from every generation that I just can't warm up to. I suppose if I'd bothered to use them it would help, but... yeah.
-I don't like Probopass, but I think about everyone agrees with me on that one. I've never liked Nosepass either, so, nothing for that.
-I have yet to warm up to Conkeldurr- sorry, there are better looking Fighting-types out there for me, and I'll be sticking with them. Amoonguss is a similar case. (Timburr, Gurdurr and Foongus I'm okay with, though.)
-I don't know why, but I really don't like Qwilfish, either. And the fact that it has Intimidate cracks me up. It looks like it'd try to be scary but fall flat on its face.
And, for some of those that other people dislike, lemme get my opinion in here:
-Luvdisc is adorables. Everyone hates it because its stats are terrible, don't they?
-I'll admit I didn't like Trubbish or Garbodor very much (...despite finding Garbodor's cry weirdly adorable) but I've warmed up to them after using the former in Reborn. Now if only I can convince myself to let one stick around long enough to at least evolve.
-Stunfisk is derp, but that's what makes it endearing. Okay I think it's an endearing quality, anyway.
-Oh yeah, and the inanimate object Pokemon get a lot of hate, but come on. This gen has some great ones. Sentient ghost swords and keys that jingle at the opponent threateningly to try to intimidate it. Come on, people.
Oh, and this isn't a specific Pokemon, but the fact that Fairy types are all girly/foofy/pink gets on my nerves like no tomorrow. Can we have an intimidating looking Fairy, at least? Xerneas is the closest we've come and I wouldn't call that intimidating. (Before you bring up Granbull literally having Intimidate, I have a hard time taking its pre-evo- a pink bulldog in a dress- seriously in the first place. No. Ilu still Granbull, don't hate me... ;A;)
That was a whole lot of rambling and only partially relevant I am so sorry