No. However, you can travel between Johto and Kanto via the S. S. Anne and the Magnet Train (if you have fixed the power plant). You can also fly to either Kanto or Johto from the Pokemon League, I find it to be an effective middle ground for travel between regions
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You can do one of the following: Ride the magnet train in Saffron City, Fly to the pokemon league and go to the left hallway this will lead you to Tohjo Falls which will lead you back to Johto.
by completing all the gym battles in johto( then finding the dragon fang) and you will get a phone call from prof elm,fly to his lab,then he will give you a master ball,to get more balls equip a Pokemon with a master ball and duplicate that Pokemon
no
after u defeat Pokemon lege u get ticket then fly to olivine then take the boat 2 kanto
HM 02 Fly is with the woman outside Cianwood City Gym.