I exited the Dragon's Den cave and healed my team at the local Pokemon Center. I then walked south on Route 45 and battled all of the trainers on the mountain road. After training a bit in the tall grass and catching some of the Pokemon, I finally got back to New Bark Town and I visited Professor Elm's lab again. He gave me the Master Ball as a reward for obtaining all of the Johto badges and I left to train in other parts of Johto. After a bit of exploring, I went to Ecruteak City and visited the Dance Theater. I battled the five Kimono Girls in battle in order to get them to awaken my version's mascot. It was a tough challenge, but I finally defeated them and they all agreed to help me summon Lugia. I saved the game afterwards.