The Lunar Duo, like the Eon Duo, is a pair Pokémon that are closely related: Darkrai and Cresselia.

In the Anime Darkrai leads Cresselia in a perpetual Cat and Mouse game with Darkrai stopping only to cause Bad Dreams and Cresselia scaring it off and healing anyone in the vicinity with its Lunar Wing.

Darkrai is the Pokémon of the New Moon and resides on Newmoon Island.

Cresselia is the Pokémon of the Crescent Moon and resides on Fullmoon Island.

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