yes u can. the rainbow wing is found in pewter city. there is an old man that has blue hair and he will talk about his childhood. he will give it to you.
It was such a long time ago that i cannot remember where the silver wing is but it is out there.
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If you're playing Pokemon silver, silver wing will be given to you after beating team rocket in the radio tower.
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You get Silver wing After defeating the team rocket in the radio tower POKEMON SILVER ONLY. Rainbow wing Is found much later in the game After the Elite four In pewter City POKEMON SILVER ONLY.
You get the Rainbow Wing from a man in Pewter City next to the poke mart
Talk to the man standing by the entrance to Mount Moon, and he will give you the Rainbow Wing (Silver Version) or the Silver Wing (Gold Version)
in pewter city
Those items aren't in LeafGreen.