Cosmeon

The cosmeon is an eeveelution of immense power. They are described as having white fur with the paws and the tips of the ears being black, yellow eyes, and a red crescent moon on their forehead. They are about the size and shape of an umbreon (approximately 3 feet/1 meter tall and 59.5 pounds/27 kilograms heavy). An eevee will become a cosmeon if exposed to a Moon Stone.

Cosmeon are so immensely powerful that they are able to manipulate time and space to their will. They have been shown hopping between different dimensions, transporting other pokémon to alternate realities, and even creating their own, personal dimensions, as well as travel through time with ease.

Approximately 100 years prior to Stun, the clefairy line began hoarding Moon Stones for themselves, causing the cosmeon evolution to die out or flee to alternate realities.

Although the cosmeon eeveelution originated strictly from Dimension A, it is possible that soon we may see one appear in Dimension B.