you can't get a wing set but on one of the bridges there are shadows. if step on one it might be a wing.
I think it's called a Muscle Wing. YOu can find them on the two bridges in the game on the shadows.
It relates to the ghost in pokemon white 2/black 2 where she haunts the strange house and in it is the lunar wing and then cresselia will appear on Marvelous bridge if you have the lunar wing.
It is Cresseliayou meet Cresselia after the hall of fame in pokemon black+white 2 you need to retrieve the lunar wing first from the Strange House near Reversal Mountain. then go to marvelous bridge and you will meet Cresselia
magpie
A small white bird with black wing tips is likely a seagull. Seagulls are known for their white feathers and black wing tips, which help them stand out against the sky. These birds are often seen near bodies of water and are known for their scavenging behavior.
At any Pokemon Center. There isn't anyone who will buy it for more.
In navel Rock
Once you have the Lunar Wing in Pokémon White 2, you can go to the Marvelous Bridge and as you're crossing it, the wing will summon Cresselia so that you will have a chance to battle it and catch it.
It can be found on Driftveil Drawbridge or Marvelous Bridge.
in the pokecave you have to find the rare pearl
you go to pewter city and find the old man on a hill and he will give you the silver wing
you can capture darkrai by going in the strange house and find its secret then go to the marvelous bridge hold out the lunar wing and cresselia will come you should save when he comes when you capture her go to a pokemon center deposit all of your pokemon then withdraw cresselia then go to the giant chasm find the hidden grotto in the first tree path you see once you go in there darkness will surround you go the white lunar wing cresselia will make it bright but darkness will surround the hole grotto cresselia will have nightmare's while you battle darkrai remember to save before you go in the grotto enjoy i just tried this and either i had the wrong cresselia (tried both the one i captured in black 2 and the one imported from pearl) or i was in the wrong grotto (directly north of the entrance to the giant chasm crater forest) but this did not work at all. it doesnt work the guy lied .just hope for a wifi event