You can't. Sorry.
Sorry No you can see some of the johto league Pokemon on Pokemon diamond and pearl if you go to the battle tower. ive seen a totodile and a cynaquil already. ;)
Uh...there isn't one...
Pokemon Pear [and Diamond] is located in the Sinnoh region. You will not be able to get to the Johto region unfortunately. Sorry.
== ==
Obtain 200 Pokemon in Pokemon ruby, sapphire or emerald, then go to professor birch and you get to choose one of the johto starters, then you migrate the starter you chose to Pokemon, diamond, pearl, or platinum.
no, in Pearl as well as Diamond and Platinum, you can only be in the Sinnoh region
No, you need to trade or transfer them from Emerald.
sorry. There is no way to get to johto with Pokemon leaf.
no you can not go to johto reigon on Pokemon red the only game that i know that you can go to johto is gold,silverand crystal version
No but in Pokemon crystal you can go from johto to kanto to johto etc.!!!
not originally, but if you migrate them then yes.