Diggersby is probably the ugliest Pokemon I've ever seen, and I don't say that lightly. There's something about the colour scheme and massive arm-ears that I inherently dislike. I'd say that one's probably my least favourite, just due to the reasons I listed. From the looks of things, I'm not in a minority here.
Other honourable mentions are Avalugg. I'm just disappointed in it. Its pre-evolution was cute, and then it turned into a cracked table that stands there and looks incredibly smug about it. I also think the fairy type could do with better designs. I don't inherently disagree with the choice to add a new type into the mix, and I don't even mind them remixing old Pokemon with the typing, even though I'm having a tough time getting accustomed to it. What I do mind is that it's all the same girly stuff. These guys negate dragons but they don't look like they do. Also have to say that Pyroar could have been so much cooler, especially with that name.
Oh, and I've been done with electric rodents since generation I, thanks, Pokemon.
Well, that's about it for me. I was fine with most of the Pokemon in this generation on some level or another, and anything else would be nit-picking.
