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
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 get lugia in the wirl islands after you get the silver wing
why butterfly have had wing?