You get the Rainbow Wing from a man in Pewter City next to the poke mart
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You get the rainbow wing from the radio tower director after you get rid of team rocket. (Same thing in soul silver).
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.
in pewter city
You can't get them.
Those items aren't in LeafGreen.