Can you get both the silver wing and the rainbow wing?

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.