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(Updated, with a nice, fancier, more detailed image. The other was moved to scraps [link]
Specie: Poltergeist Pokemon
Spectreon are very unruly, destructive, and hateful creatures, especially towards their trainers. They frequently throw about any surrounding objects and smash anything they please. In the wild, they will spend their eternity haunting their death site and terrorizing any unsuspecting intruders.
Eevee becomes a Spectreon if it suffers through a violent death, or if murdered by its trainer. If it knows 'frustration' it will be a powerful, though coldblooded ally. It is bound to its trainer by an arcane power that prevents them from seperating, but which keeps it from causing any physical harm.