Hi! Thank you so much, I’m glad you like the puzzles haha :)
The Snorlax one is a puzzle you won’t be able to do until you talk to Professor Oak, and it only blocks Routes 12 and 13.
All of Kanto can be circled without having to go through areas where the police won’t let you pass. You can head toward Cerulean City or Cinnabar Island and go around all of Kanto without any problems, it’s a closed loop with no blockages.