You can the Pokemon from the johto region once you have the national pokedex. To get the national pokedex, catch 60 or more Pokemon from the kanto region then go and see prof. Oak in his lab in Pallet town.
You can't.... But you can get johoto Pokemon in the game and from Pokemon colluseam.
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You can't go to Johto, but you can catch Johto pokémon. Obtain the National Pokedex (defeat Elite Four and catch 60 species of Pokémon to obtain the National Pokedex) then the Sevii Islands are the place to go.
You can't get to the johto region in firered.
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
You can NEVER go to the Hoenn region in LeafGreen or FireRed. You may trade with Ruby/Sapphire/Emerald, but NO!!!
Hoenn is the only accessible region in pokemon Ruby, Sapphire, and Emerald
Click new game and there you go.