Mimikyu

Mimikyu is a Pokémon which was first encountered in the game "Pokémon Sun and Moon."
Appearance.
Mimikyu is one of the strangest Pokémon as its true identity is hidden under the disguise it has on. There has been many fan art works of what fans believed to be Mimikyu's true form. However, recently in a anime episode it is shown that it is a ghostly orb and anyone who looks at its yellow eyes will die of shock.