Where do you find Pokemon flute in Pokemon LeafGreen?

Answer 1

Get the Sliph Scope from the Rocket Game Corner Basement in Celadon City and then go back to Pokemon Tower in Lavender Town. Fight your way through all Channelers, all of who use Gastlys and Haunters, so make sure you have something that knows attacks other than fighting and normal, since they can't affect ghost types. You CAN make it to the next to the last room without the Sliph Scope, but all the Gastlys, Haunters, and Cubones that can be caught in the tower will appear as Ghosts that can't be attacked or caught. At the last staircase, something will scream "get out" and a Marowak ghost will attack you. The only way to defeat this Pokemon is to get the Scope and kill it. You can't catch it or run because it's spirit will not "rest" until it's been defeated. If you don't have the Sliph Scope, you can only run, and that won't get rid of the Marowak. In the last room, there are a few Rocket grunts. Beat them and the old guy will take you back to his house in Lavender Town and give you the Pokeflute.