simple, he's in whirl island but you need to get the silver wing from an old man in pewter city.
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.
Yes you can. In Soul Silver you get to catch Lugia first. But in Heart Gold, you have to defeat the Elite 4 to get Lugia. Go to Whirlpool Island.
You cannot start Heart Gold with Lugia.
Never heard of it. Although, there is a gold Lugia.
Whirl Islands
By MasterBall
you need wirlpool then go to the wirl islands in one of them there is lugia
Lugia is in Pokemon Silver, Soul Silver, and Heart Gold.
in the seaform islands
cinibar islands
you cant
lugia is in the games soulsilver,gold,silver,heartgold,crystal,firered,and leafgreen