I regret making this post
Gen 1: Those faces, oh my god. The rest of the design is okay enough but those faces creep me out. Still a decent Pokémon, but it creeps me out.
Gen 2: It has really strange antlers, and the huge nose of it creeps me out.
Gen 3: I has arms on it's chest. It just looks wrong.
Gen 4: "Hey guys, let's add random plates to rhydon, give him a bad tan job and make him morbidly obese! It will be great!"
Gen 5: / "Let's put lots of random stuff on a basic dragon design, then put some wires on it to make it even stupider! That will be awesome!"