How do you get the Pokeflute in Let's Go Pikachu?

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Tags

1. #complete
2. #silph
3. #obtaining
4. #quest
5. #unmask
6. #pokemon
7. #clearing
8. #rocket
9. #tower
10. #scope
11. #first
12. #celadon
13. #ghosts
14. #pokeflute
15. #thankfully
16. #hideout
17. #involves
18. #lavender
19. #story
20. #which