No, unfortunately ;_;
The only games that you can Re-Battle Gym Leaders on is Platinum, HeartGold, and SoulSilver
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You cannot rebattle 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
You cannot re-battle the Gym Leaders in Pokémon Black and White.
You cannot fight the Gym Leaders again in Pokémon Black after defeating them and being awarded their Gym Badges.
ha! you don't. or if that's not what u were lookin for, start the game over . not much of a bargain ey bud. -ho-ohawesomeness