A species related to Eevee I designed for a Pokemon region based on Alaska, it is a Ghost Type with a sad backstory...

It is thought that Reveevee came into existence when an Eevee who died without ever getting to decide what it wanted to evolve into was reborn due to its desire to evolve. It constantly roams the world, searching for a missing piece to fill the hole in its head, and when it finds that piece, it allows Reveevee to finally evolve.

When given a Water Stone, Thunder Stone or a Fire Stone, it will evolve into three different forms.