As you continue to explore the Kanto region in Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee!, you will soon come across a sleeping Snorlax that’s blocking your path.
The Poké Flute is the only way that you can wake up the Sleeping Pokémon, an item that, in the world of Pokémon, is described as “a flute that can play with such a beautiful tone that even sleeping Pokémon find themselves woken up.” Perfect. But, where can you find it?
While the Snorlax is slumbering east from the international port town of Vermillion City, but the Poké Flute is, unsurprisingly, in a completely different location in Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee!.
To get the Poké Flute you must first brave Pokémon Tower in Lavender Town, a challenge that will first require that you grab the Silph Scope from Team Rocket’s secret hideout in the Rocket Game Corner in Celadon City.
Once you have the Silph Scope, you can identify the Ghost-type Pokémon that haunt Pokémon Tower, and, once you have reached the highest floor, you will rescue Mr. Fuji who Team Rocket have captured.
After he is saved, he will invite you back to his house where he will give you the Poké Flute as a gift to say thanks. From there, you have what you need to wake the snoozing Snorlax up.