Lugia will be in Whirl Islands. You will need to get the Silver Wing from the old man in Pewter City before you can encounter Lugia, however.
in Whirlpool island
If you are on the right island you will find lugia
You can't get Dark Lugia in Pokemon Silver, Gold, or Crystal. You can get Dark Lugia in Pokemon XD though. For Pokemon Silver, Gold, and Crystal it is just the regular Lugia.
Lugia is in Pokemon Silver, Soul Silver, and Heart Gold.
Lugia isn't available in Pokemon Emerald, it is available in other versions such as Soul Silver, Gold, Silver, Crystal, FireRed and LeafGreen.
go to whirl islands and find lugia deep inside
cinibar islands
you cant
you need wirlpool then go to the wirl islands in one of them there is lugia
In Pokemon Heartgold, Lugia can be found at the top-right island of the Whirl Islands Area. It's at Lv. 70 so prepare.
You cannot find Lugia in Pokémon Platinum.
You can find lugia in navel rock