Lots of Pokemon being named here, I don't mind at all. I actually think Emboar looks amazing, Garbodor's looks fit its theme well, Stunfisk's derpiness has a certain charm to it, etc. I came here, went down everyone's lists, and couldn't find one Pokemon that I, personally, found to be ugly among them.
... But there is one that exists.
I kid you not, I look away from my screen whenever this Pokemon comes up. I literally gagged the first time I laid eyes on it. It's just... horrifying. The stuff of nightmares. My goal in life is to find the sadist who dared to put... that... in my Pokemon games, and make them suffer physically the same pain I suffered mentally because of this abomination of anything resembling life. I haven't had religion since seeing it, because no God in all His might would ever give a man the ability to create such a monstrosity; something that makes the brain blister and the eyes boil with blood. I will find an image, and I will link it, and then I will clear my browser history and spend the next few minutes washing my eyes with soap and water, followed by feeding them images of beautiful women and Snubbulls to make the memory go away for another feeble amount of time before I'm reminded of the horror again.
... I don't want to google it. But I will. You will all suffer the injustice of this... THING... with me. The pure, unedited horror... A Pokemon who, in one form, is perfectly fine, but in another, with such minor details added, becomes the most disgusting, grotesque thing ever conjured by the human mind...
Dear God why...