Agnome

Agnome is a small, gray-blue, fairy-like Pokémon. It has two tails that each have a red jewel on them. These are, presumably, two of the jewels which complement the Red Chain. Agnome has a partially cyan face with another red gem encrusted into its forehead. Agnome has a cone-shaped head with elf ear-like protrusions on each side.

Agnome's spirit can leave its body without dying and can return to the body at will. It sleeps at the bottom of a lake to preserve the balance of the world. It can control an individual's will or enter the body of an individual. Legends say that if Agnome is harmed, it can cause humans to lose all will inside of them, making them completely immobile for all eternity.

(Source: Bulbapedia)