Yes, there will be Gym Leaders in Black and White. It has the usual 8 Gyms however there are 2 differences. The first Gym has 3 Gym Leaders but you'll only fight 1 of them depending on the Starter you chose and the last Gym has 2 Gym Leaders but the Gym Leader for that Gym differs depending on your game.
You cannot re-battle the Gym Leaders in Pokémon Black and White.
sorry but no
you have to beat gym leaders
no you cannot but you can battle latias/latios
You cannot rebattle Gym Leader in Pokemon White.
First you have to complete all Gym Leaders & get all of the badges. Then you head to the Pokemon League.
Because black and white is a reboot; in the original series ash traveled with brock and misty, 2 gym leaders. So in Black and white series ash travels with cilan and iris, also gym leaders.
Well There is no way to rematch the gym leaders unless if you hack it!
No.
You cannot.
Hackless, NO!
You cannot.