You can. Go through Diglett's Cave.
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you cant
u cant go to the kanto but u can get kanto Pokemon in 2 ways.1 u can look 4 them.2 if the game boy trader thing you cood trade Pokemon.
You cant get a kanto starter on Pokemon sapphire but if you have Pokemon emerald then you complete the pokedex then you get a choice of starters from the johto region. I hope this helped.:)
No but you can go to kanto but you can own sinnoh pokemon.you cant
To do it in johto just get the card thingy after you get 7 badges but in kanto you cant