Just go over and touch the entrance to Mt. Moon! SPOILERS: It's a Trap!
Credit to Admiral Ackbar, a Star Wars guy, Random Encounters for the idea of the trap from his Singachu https://www.youtube.com/watch?v=DiwPPlvtNOY and The Zubat Song https://www.youtube.com/watch?v=11DOsg6i42k, Nintendo for Pokemon, and Bulbapedia for the pic of Mt. Moon.
