I wasn't really a fan of any of the starter's final evolutions.
Some of the evolutions they gave to Pokemon of previous generations were awesome, but others failed in design. Magnezone, Probopass, Tangrowth.
I hated Ambipom at first but after it popping up every other episode in the anime, it grew on me and I like it now.
Of course there's the "oh God why" Pokemon, one's that are hideous and really have no purpose because they are fairly week. Bibarel (I guess a good HM slave,) Kricketune, Wormadam, Purugly.