In Pewter City (kanto*). Talk to this old guy near the right of the city for it.
* You need to beat the elite four in order to get to the other cities in kanto.
I'll be a little more specific :
After beating the Elite 4, you will be permitted to enter the cities of Kanto. Find your way to Pewter City, go to the town MART, and to the right of the mart, you will see an old guy, talk to him.
Talk to the man standing by the entrance to Mount Moon, and he will give you the Rainbow Wing (Silver Version) or the Silver Wing (Gold Version)
You get Silver wing After defeating the team rocket in the radio tower POKEMON SILVER ONLY. Rainbow wing Is found much later in the game After the Elite four In pewter City POKEMON SILVER ONLY.
first you have to beat team rocket when there in mahogany store and then you go to the radio tower in goldenrod and beat team rocket there and when your done with that the radio station director will give you the silver wing... good luck
You don't get either in firered, to get lugia and ho-oh get them from Pokemon colosseum and Pokemon xd gale of darkness.
In Crystal you have to catch all three dogs to receive the rainbow wing. After getting the clear bell (team rocket at goldenrod) you can go to tin tower and get suicune. Then catch entei and raikou and go back to tin tower. One of the sages will give you rainbow wing.
you can find it in pewter city there's an old that walks around near the mart
The silver wing is an item in Pokémon Crystal version. You can find this item in Pewter City on the right side.
In SoulSilver Version, the Silver Wing lies in the hands of the Director in Goldenrod City.
you can get lugia in the wirl islands after you get the silver wing
at the entrance of route 3 at pewter city
Talk to the man standing by the entrance to Mount Moon, and he will give you the Rainbow Wing (Silver Version) or the Silver Wing (Gold Version)
get silver wing talk to the guy in pewter and go to seafoam where articuno is
It is in pewter city. You get it after talking to some man.
Once you have it, you can catch Lugia on Whirl Islands. It's the one at the bottom.
after you beat the elite four, you can go to to the Kanto region. (at least i think its Kanto its the one with Brock and misty) at the first city, pewter town, there is a man next to the Pokemon center after you beat Brock he will give you the silver wing (gold version) or the rainbow wing (silver version).
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
From a man outside the poke mart in pewter city