the rainbow wing is your key into the bell tower. you just walk in and as you talk to the monk blocking your way, it will hover above your head and he will let you through. go through the tower until you get to the roof. the kimono girls will summon ho-oh with the help of your clear bell (if your playing soulsilver and beat the elite 4, you don't need a clear bell) in heartgold ho-oh is level 45, in soulsilver he's level 70, but you can only catch him once you've reached kanto and gotten the rainbow wing. (same for catching lugia in heartgold)
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You get the Rainbow Wing from a man in Pewter City next to the poke mart
You don't 'use' it. You need silver wing to get Lugia. It's located in one of the four islands to the south without Silver Wing in your pack it won't apear. Same with Ho-Oh except with the Rainbow Wing.
You get the rainbow wing from the radio tower director after you get rid of team rocket. (Same thing in soul silver).
Those items aren't in LeafGreen.
Ah, the Rainbow Wing is a special item in Pokemon Crystal that you can get by talking to the Copycat in Saffron City after giving her back her lost Clefairy doll. She'll then give you the Rainbow Wing, which is needed to encounter the legendary Pokemon Ho-Oh at the Tin Tower. Just keep spreading kindness and helping others, and you'll find the Rainbow Wing in no time.