When you find them out of their gyms the second time, talk to them and they'll give you their number. If you call them they say what day you can re-battle them. You'll re-battle them at the Dojo in Saffron City next to the Gym. When it is the day where you can re-battle them, go to the Dojo and they'll be there.
you can't
no sorry i wish only johto and kanto
it was about two or three of the gym leaders
america
you can battle a gym leader as many times as you like after all 16 gyms and both leagues in the kanto region next to the 2nd kanto gym only cirten gym leaders a day
just battle the gym leaders just battle the gym leaders just battle the gym leaders
Sorry, no. Only kanto and johto.
Blackthorn and mohogany
at their gyms.....
i don't think you can battle ALL OF THEM again but you can find one of the leaders sometimes in a certain place, talk to them a they will give you their phone number and they'll tell you what day of the week to visit them at their gym so you can battle them. hope you have fun! -RR14
how about.. BATTLE HIM
You have to search Johto and Kanto and find all the gym leaders out side of there gyms and and then talk to them and they will eventually give you their numbers