Poké Flute

Poké Flute is a key item in the Pokemon series. Used for waking and removing Snorlax from Route 12 and Route 16.

It can be obtained by making your way to F7 of the Lavender Tower in Lavender Town to 'rescue' Mr. Fuji from Team Rocket.

F7 will only be unlocked once you've also obtained the Silph Scope from Silph Co. You can then identify the spirit of the long lost Momma Marowak.

Mr. Fuji will advise you that he came to the Tower on his own to see that Marowak's spirit has been seen off. For completing the task for him, he will provide you with the Poke Flute to further your journey.