it allows you to be able to see the leagendary lugia
get the silver wing
eat it
In SoulSilver Version, the Silver Wing lies in the hands of the Director in Goldenrod City.
you go to pewter city and find the old man on a hill and he will give you the silver wing
no only in soulsilver but if you want the rainbow wing it is in johto
get silver or rainbow wing in radio tower
The silver wing is used to get Lugia in both Soulsilver and Heartgold, while the rainbow wing is used for Ho-oh
on your way to mount silver there is a house that you go in and they give steel wing.
tidal bell and silver wing
If you're using heartgold, after beating the Pokemon league go to pewter city and an old man on a hill will give you the rainbow wing in soulsilver and the silver wing in heartgold.
You don't get the Clear Bell in SoulSilver. But you don't need it. You only need the Rainbow Wing to capture Ho-Oh in SoulSilver. You get the Rainbow Wing from a man in Pewter City.
You can find it on Whirl Islands, if you have a Silver Wind. If you play SoulSilver you also need Tidal Bell with the Silver Wing.