After you have beaten the Elite 4 of Johto and Champion Lance,the credits will start.
When the credit ends you will be sent back to your house you will have to go to
Professor Elm.He will then give you the S.S. Ticket and tell you to go to Olivine City's
harbor.You will then be transported to Vermillion City in Kanto.
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First you have to defeat the pokemon league and go to Kanto. In Kanto you have to go to Oak's lab and he will offer you one of the three starter pokemon for Kanto.
I believe that you can get to Kanto after defeating the Pokemon league and getting the National Pokedex.
Pokemon HeartGold Will Have Sinnoh,Kanto,But Hoenn Least Likely.
you can only go to kanto and johto
No but you can go to kanto but you can own sinnoh pokemon.you cant