Ash went there because he lose the Kanto League in the anime. Now, if you're talking about RED, that's other topic, as Ash has NEVER appeared in any main game.
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charizard burning ambition i think
You can't get to the johto region in firered.
No you don't.
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