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The final gym is the Viridian City Gym. Blue is the Gym leader.
Not enough info: which gym leader?
Blaine.
Blue, the last gym leader in kanto region
on Chamber Island
The orders of the gym leaders in Kanto are not set, so the 2nd gym leader could be almost any of them. However, if you are looking for Misty (Cerulean City Gym), she is on Route 25.
The eighth gym leader still awaits, as well as the whole of Kanto.
gem leader blue
You need to have defeat the other gym leaders of Kanto first, after that you will find Blue on Cinnabar Island, talk to him and he will return to his gym.
The Kanto Gym leaders are located all throughout the region. Most major cities have one gym leader. Make sure to look around for the gym sign. Very few cities do not have a gym leader.
Misty, from the Cerulean Gym in Kanto likes Ash.
actually there isn't 9 gym leader there is only 8 like the other ones. Actually, the 9th gym leader in heartgold and soulsilver would be the first gym leader in Kanto after you beat the elite four the first time, you can face the kanto gym leaders in any order.