How to Travel to Kanto From Johto in Pokemon
- 1). Fly to New Bark Town. Make sure that you have a Pokemon that knows Surf, Waterfall, Whirlpool and Strength.
- 2). Surf east on the body of water in the eastern part of New Bark Town. Once you reach land, a man will come up to you and tell you to check your PokeGear, where you can see a new map of Kanto.
- 3). Go North to enter Tohjo Falls. Once you are in, surf up the waterfall and down the other side, and then exit the cave.
- 4). Surf east. Once you hit land, defeat all the Pokemon trainers. Head north to reach a large building. Enter the doors at the end of the hallway to reach Victory Road.
- 5). Go through Victory Road. Once you are near the exit, your rival will battle you. After the battle, exit the cave and go through the doors of the Indigo Plateau.
- 6). Heal your Pokemon and stock up on healing items. When you are ready, go through the northern door to challenge the Elite Four.
- 7). Defeat the Elite Four. You will then be taken back to New Bark Town. Talk to Professor Elm to get the SS Aqua Ticket.
- 8). Fly to Olivine City and board the SS Aqua. Once you get off the boat, you will be in Vermillion City in Kanto.
Source...