How do you get Lugia to appear at the waterfall in Pokemon SoulSilver?

Answer 1

In order to get Lugia to appear at the waterfall in the Whirl Islands in Pokémon SoulSilver, you first have to beat all 8 of the Johto Gym Leaders and receive the Master Ball from Professor Elm. Next head to the Dance Theater in Ecruteak City and the 5 Kimono Girls will challenge you to a battle. After defeating all 5 of them they'll give you a Tidal Bell and run off. Now you can head to the Whirl Islands in order to summon Lugia at the waterfall in the Whirl Islands.
In order to get Lugia to appear in Soul Silver, you first need two items. You need to have the silver wing and the silver bell. Once you have those, go to the Whirl Islands and find your way to the waterfall. Once there, a cut-scene will appear and after the cut-scene, (you also need surf) you surf on the water in front of the waterfall and talk to Lugia. Then the battle will start giving you the opportunity to catch it.