How do you get the rainbow wing in Pokemon crystal if you talked to the man in pewter and he gave you a silver wing?

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.