The Rainbow Wing (Japanese: なないろのはねPrismatic Feather) is an item that allows the player to encounter Ho-Oh in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team and Pokémon Mystery Dungeon: Rescue Team DX. It is the final form of the Clear Wing (Japanese: とうめいのはねClear Feather), which is transformed into the Red Wing (Japanese: しんくのはねCrimson Feather) and then the Sunset Wing (Japanese: ゆうひのはねSunset Feather) before becoming the Rainbow Wing.
The player must then talk to Xatu at the Great Canyon, who will explain what the player must do next. After defeating Entei at Fiery Field, Entei will turn the Clear Wing into the Red Wing, and send the player to Lightning Field.
After defeating Raikou there, Raikou will turn the Red Wing into the Sunset Wing and send the player to Northwind Field.
After defeating Suicune here, Suicune will turn the Sunset Wing into the Rainbow Wing and send the player off to Mt. Faraway. Here, due to the power of the Rainbow Wing, the player can encounter, battle, and recruitHo-Oh.