A Rainbow Wing played a major role in I Choose You!. Set in a timeline different from the main series, it was found by Ash when he first saw Ho-Oh. During the movie, Ash learned that Ho-Oh had given him the Rainbow Wing as a recognition of having chosen him to be the "Rainbow Hero", and decided to travel to Mount Tensei to meet and battle Ho-Oh.
Eventually, Cross, wanting to meet Ho-Oh himself, stole the Rainbow Wing from Ash and tried to use it to summon Ho-Oh. However, it instead became corrupted by his selfish desires, causing Marshadow to send a group of wild Pokémon on a rampage. When Ash was killed by the rampaging Pokémon, the Rainbow Wing crumbled away. However, once Ash was revived, the Rainbow Wing was also reformed, allowing Ash to use it to summon and battle Ho-Oh.
Another Rainbow Wing appeared in Finding a Legend!, under the ownership of an old man named Jaye. He used to search for Ho-Oh for many years after having caught a glimpse of it in the past. However, after years of failing to find it, he became convinced Ho-Oh didn't actually exist and threw his Rainbow Wing away. However, his grandson Chad took and preserved it, wanting to restore his grandfather's belief in Ho-Oh's existence. Ash and Goh later visited Ecruteak City and heard Jaye's story from Chad. Afterwards, they decided to accompany Jaye and Chad as they climbed the Bell Tower in the hopes of summoning Ho-Oh with the Rainbow Wing. At the top of the tower, the Rainbow Wing ended up glowing in response to a rainbow appearing in the sky. Just when the group was about to leave, Jaye saw Ho-Oh flying in the distance.
The Rainbow Wing and Silver Wing were revealed to be on Yellow's hat. These artifacts were used to free Gold from the gap of time inside the Ilex Forest shrine where the Masked Man had trapped him in.
The Masked Man also used a Rainbow Wing and a Silver Wing directly collected from their respective Legendary Pokémon in order to create a GS Ball. Only a capture net created from these two feathers could contain Celebi and allow its holder to travel through time without suffering its negative side effects.