I dunno if this has been asked but I'm in Kanto and I've defeated Lt Surge, Sabrina, Misty, Erika and Janine but now I'm stuck where do I go?
Go through the Diglett Tunnel (Where Snorlax is) and you can head off to either Pallet or Pewter, both which you'll have to visit eventually.
To add to this, you need to play the PokeFlute station to wake Snorlax up. You do that by going to the Lavender Radio Tower and speaking to the man in the suit after you've returned the Machine Part to the Power Plant. He'll update your radio and you'll be able to wake Snorlax up.