Ghost-type Pokémon, Cubone and Channelers reside in this tower. Remember not to use Normal or Fighting-type moves here as they will be ineffective to Ghost-type Pokémon. Follow the stairs and go up to Lavender Tower F7. Speak with Mr. Fugi to get the item Poké Flute.
Now you have a choice, you can either head to Fuchsia City or back to Saffron City. To go on to Fuchsia City, go south from Lavender Town and it will lead you to Route 12. If you would like to return to Saffron City, leave Lavender Tower and keep on going west, passing Route 8.