Aterrium

Aterrium is a Cosmic-type Pokémon introduced in Generation Neo-I.

It evolves into Orbitro starting at level 27, which evolves into Nuclorbit starting at level 41.

Biology
Aterrium is a small red orb that floats above the ground. A faint cloud of electrons can be seen zipping around its body. Aterrium has a happy face.

Triva
Aterrium may be based off of both an atom as well as a planet.

Aterrium may be a combination of atom and planetarium.