There are a lot of Pokemon. A lot of Pokemon evolve. A lot of people don't like what they evolve into.
Which evolutions would you change?
Personally, I love the Duskull line... However, if I had my choice on how it evolves, I would have made the skull be the major thing that carried over. I was disappointed that the Pokemon with the skull mask evolved into a Pokemon that took the cyclops theme, and ran with it.