Unpopular opinion but maybe Fidough? There's something really off about its official art and the model isn't much better. Love its evolution.
I agree with you on this! To be fair, though, it
is supposed to be a half-baked Pokémon, and I find the concept behind it really clever. However, like you, I much prefer its evolution.
Speaking of dog Pokémon, I forgot to mention Maschiff and Mabosstiff. No offense, Arven, but Maschiff looks like it has a poop head and Mabosstiff's eyes look really weird however you look at them. You keep doing your thing and loving your big stinky doggo, but don't expect me to let him slobber me.
Hyzenthlay also mentioned Frigibax, which brings me to... the entire line. What the hell was Game Freak on when they made Baxcalibur? Were they playing the NES Godzilla creepypasta game and decided "hey, let's make another Godzilla that looks more like a sprite?" Either way, I hate it.
Lastly... I didn't see anyone mention Skeledirge. It's okay, it's growing on me and I admit it's the most salvageable of the three starters, but it doesn't mean it's not ugly as sin. It could have afforded to be less eDgY and more Round like both of its pre-evolutions.
...Gosh, I'm gonna end up mentioning the whole Dex sans Dachsbun, the Pawmi line, the Charcadet line, the basic-stage starters, Farigiraf, Kingambit, Chien-Pao and Miraidon at this point, am I not?