Nuclume is the most hazardous of its evolution line. Due to nuclear fusion, Nuclume constantly combusts within its shell, which releases a dangerous radioactive gas.
Nuclume's signature attack is Atomic Burst, in which Nuplume's smoke receeds into its shell, it angles the opening of the shell to its foe, then releases a very powerful green blast at the foe. This attack is somewhat low in accuracy, but can usually end a battle.
Nuclume primarily feeds on CO or Carbon Monoxide and drinks CS2 or Carbon Disulfide
I can imagine seeing a video with radioactive from imagine dragons playing, the video depicting a radiom battling an extremely tough apponent, and when it is just about to be defeated it evolves into nuclume, goes on to use atomic burst and instantly win the battle
I think it should be a a poison/steel type. It wouldn't be weak against psychic or fighting. Leaving only a weakness to fire and super weakness to ground. His ability should also probally be Aftermath.
Too bad the whole "Dangerous Nuclear Reactor" thing probably wouldn't fly in Japan right now. >.>