Eclipse was born in the Alola islands as she has the sun and moon half on her belly as she is a balanced between light and dark days and only intervenes on stuff between good and evil if she believes it is necessary. With her immense psychic powers she can be able to nom prey bigger then her that she can either keep them safely tucked away in her belly or digest them if they need to be brought to justice. With the eye on top of her head she can read most weak minded pokemon if they have any secrets she needs to know and sometimes if she thinks hard enough she can read the mind of even dark types even with their immunity to psychic. She can even resist some of her usually weaknesses and devour those that could be able to do harm to her and even nom ghost types that would normally just escape with phasing in and out of existence. She also has 2 other siblings that have a sun symbol and a moon symbol on them respectively.

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Eclipse is mine

Mew belongs to Game Freak and Pokemon Company