You can't. Sorry.
Pokemon Pear [and Diamond] is located in the Sinnoh region. You will not be able to get to the Johto region unfortunately. Sorry.
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You can't get to Johto region in Pokemon Diamond/ Pearl, but you start there in Heartgold/ Soulsilver.
Cynthia is not the champion in the johto region in Pokemon heartgold,you can't find her in it, but she is the champion in Pokemon pearl,diamond, and platinum versin and that is the sinnoh region.
There are 100 johto Pokemon in all.
No
The oldest Pokemon games to feature Johto are Gold, Silver, and Crystal. FireRed and LeafGreen partially feature Johto after you beat the Elite Four. The newest games to feature Johto are HeartGold and SoulSilver.
no, in Pearl as well as Diamond and Platinum, you can only be in the Sinnoh region
All the Pokemon that didn't exist in that particular region. Example in firered and leafgreen you can get johto and hoenn Pokemon like lugia or rayquaza. In diamond and pearl you can get stuff from kanto and johto and hoenn.
You start out in the Johto Reigon.
sorry. There is no way to get to johto with Pokemon leaf.
Cyndaquil is from the Johto region.