if im not mistaken pewter city is with brock... you go to Vermillion City and go to Route 11 there is a Snorlax in the way go to your Pokegear radio and pull the circle thing to the top and you should see Pokemon Flute
Pewter City
You can fly there or go west.
At the top of pewter city in the kanto region
talk to the man on the platform in pewter city
Its in Kanto to the right of Pewter city.
go down at pewter city
to pewter city
go to the museum in pewter city
After you get the silver wing from the old man in pewter city
Go north from Viridian City or south from Pewter City.
In kanto, south of pewter city, north of viridian city.
In Pewter City. There is an old man on a hill that gives you a silverwing