Hi,
Once you've got all the Johto gym badges you go to Pewter city and there's an old feller there who gives it to you.
If you can't find him there there's a small chance it may be one of the other cities- my memory isn't the best. But it's an old wrinkly guy who you meet in Kanto somewhere.
You then meet lugia in a cave at the bottom of a waterfall underneath whirl islands.
Good luck!
The silver wing is an item in Pokémon Crystal version. You can find this item in Pewter City on the right side.
In the whirl islands with the silver wing
In Gold and Crystal, you get the silver wing from the man outside of the Mart in Pewter City. In Silver, you get the silver wing from the Director of Goldenrod radio station after freeing it from Team Rocket.
it for geting to lugia in whirl islands to get it you have to be in kato
It unlocks Lugia in the Whirl Islands. He is at the bottom.
it is in the island on the top right after you get the silver wing
I believe it is after you catch suicune that you can obtain a silver wing.
you can get lugia in the wirl islands after you get the silver wing
at the entrance of route 3 at pewter city
first you have to beat the radio tower then he will give you silver wing (silver) in gold he will give you rainbow wing crystal he will give you clear bell then go to whirl islands and search
In gold you need the silver wing just like when ho-oh needs gold wing in silver...look in the islands blocked by the whirlpool for it
get silver wing talk to the guy in pewter and go to seafoam where articuno is