No you don't.
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No, you cannot go to johto. There is however a way to migrate johto Pokemon to D/P. When fishing around in the D/P action replay codes, I found a way to make Pokemon say they are migrated from Johto (Instead of Kanto or Hoenn). This may mean that there will be a remake of Gold and Silver.
You can't get to the johto region in firered.
No because it is a sinnoh Pokemon not a kanto, johto, or hoenn
no you can't go to jhoto......
U get all the Pokemon you can't go to the johto region in pkmn ruby/Sapphire you can only do that in Pokemon emerald