How do I find Lugia?

Lugia - Silver Version

Lugia can be found in the Whirl Islands, south of Olivine City on Route 41, that can be reached by using the Whirlpool move at the little eddies that block the entrances. You get Lugia from the NorthEast Island. You'll need a Pokémon with Surf, one with Whirlpool, and one with Flash to get to Lugia.
So, at Olivine City, surf south trying to stay as far to the right as you can. There is 4 entrances to the cave where Lugia is so if you follow the wall the first one you come to is the one you need to enter.
Once inside go to the right and choose the top path when it comes to a fork. Now you'll make your way to a waterfall, go down it, then surf up and you should find Lugia swimming in the water.
Lugia is also level 40 and will give you 1257 experience points if you beat him. But DON'T, what are you crazy or something!? Again, low HP, asleep, and ultra balls should do the trick.