go to the power plant talk to the manager then go out to the cerulean gym you will find a person there chase him he will tell you he hid the missing piece of the power plant in the Pokemon gym then you go to route 25 and find the gym leader
vermillion city
In the first city
blue in viridian city
you have to go to funchisa city in kanto
you can take on any gym leader in kanto in any order (excluding blue you have to battle him last)
He is in the cave on Seafoam Island, which is east from Cinnabar.
Red is in mt.silver and blue is the eight kanto gym leader
Clair and she is the leader of blackthorn city or if you mean the kanto leader its blue/Gary ashes rivle
You have to battle the last gym leader Blue in viridian city in kanto reigion.
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.
ok he is no longer the gym leader. his daughter took over the gym. he is now the elite four trainer. i think the second one.
You can fight the Kanto Gym Leaders in any order, except Brock, Blaine, and Green/Blue.