Lunar Feather
The Lunar Wing (Japanese: みかづきのはね Crescent Moon Wing) is a key item in the Generation IV games. It can only be obtained after receiving the National Dex.
It is found on Fullmoon Island where Cresselia is floating above. The Pokémon will immediately flee the island, leaving behind the Lunar Wing. Once brought to Canalave City, it will awaken a young boy from his endless nightmare.
In the anime
File:Lunarwinganime.png
Lunar Wings in the anime.
In The Rise of Darkrai, the Lunar Wing was sold to Dawn by a salesman who said that "it will make bad dreams a thing of the past".
The very same Lunar Wing appeared in Sleepless in Pre-Battle! where it was used to find the place where Cresselia resides.
Trivia
- Strangely, the Lunar Wing is green and yellow, while Cresselia is not green at all.