Nidoking: 8/10. One of the original Pokemon, he was also obviously designed to be a monstrous badass, and it works. Even though he's "ugly", he's ugly in a cool/monstrous way, and is still aesthetically pleasing.
Qwilfish: 5/10. He's just a puffer fish, with nothing to make him stand out.
Zangoose: 7/10. The idea of his rivalry with Seviper is very cool. Even though he's supposed to be a mongoose, they made him a cat. And gave him Kratos-like markings. So he's one of the cooler cat Pokemon.
Magnezone: 8/10. The evolution of Magnemite to Magneton was fairly uncreative, but you can tell they went all-out with Magnezone; instead of having something like five to nine Magnemites linked together, they made an evil UFO robot. Badass.
Dragonite: 4/10. Looks nothing like his pre-evolutions, and disturbingly like numerous kiddie show characters like Barney (however unintentional). At the end of the day, he is a fairly cool and powerful dragon, and he looks way better when making more serious/angry faces.
Genesect: 10/10. He's a transforming robot bug, what do you expect?
Deoxys: 9/10 for Normal, Attack and Speed Formes, 6/10 for Defense Forme. Cool alien, but he'd look a bit better IMO if he had a mouth.
Dimentio, Fawful, Waluigi, King K. Rool, Ghirahim, Mewtwo, Darkrai, Reshiram, Zekrom, Hilda, Hades, Ryu, Sora, Riku, Nightmare and Wreck-It Ralph for SSB4!