Cresselia

Cresselia is a Psychic-type Legendary Pokémon.

It is not known to evolve into or from any other Pokémon.

It is a member of the Lunar duo with Darkrai.

Biology
Cresselia is a Pokémon that has a blue, swan-like body with a yellow underside. It has pink eyes, a dark pink, round tuft on its head, and a pointed, beak-like snout. There are yellow, crescent-shaped ornaments on the sides of its head. Cresselia has glowing, pink, ring-like wings on its sides and back with paw-like protrusions resting on its chest. These wings release shining particles and undulate beautifully around the quarter moon. Cresselia's tail releases an undulated and beautiful aurora during the quarter moon as well.

Cresselia has the power to dispel nightmares, and holding one of its feathers is said to bring happy dreams. It is also great at recovery and healing techniques. However, as seen in the anime, it can be quite hostile towards its counterpart, Darkrai. Cresselia is the only known Pokémon able to learn Lunar Dance. Cresselia is a female-only species.