The Gym Leaders challenge you again in the Survival Area, The BattleGround which is locked until Buck lets you in then you can VS them again!!
You cannot fight the Gym Leaders again in Pokémon Black after defeating them and being awarded their Gym Badges.
No there is not.
No, unfortunately ;_; The only games that you can Re-Battle Gym Leaders on is Platinum, HeartGold, and SoulSilver
from what i know, only in platinum
you can't. you can only fight the Pokemon league again.
You walk up to them and talk to them
You can't rematch them unless you start again
You can't fight them again if you go to their gyms. But to fight them again you have to go to the Survival Area and gain access to the place near the Pokemon Center and some of the Gym Leaders will be there.
sorry, but there isn't a code to rebattle the gym leaders in diamond or pearl. there was once an attempt but, the leaders couldn't be rechallenged without you receiving the gym badge again. once you have two of the same gym badge the game freezes.
I have competed the entire game at least 3 times and there is no possible way to re-battle any of the gym leaders
Once you battle a gym leader you can not battle them again this is the same for all pokemon games unless you want to start the whole game over again but as soon as you get the badge you can't battle any gym leaders you already beat
sorry but no