In pokemon black, I got to White Forest somehow?? And then I erased the save, created a new game, and this time it was Black City? Im confused... And yes, im 100% sure i used pokemon black both times...
Probably a bug. If that's the case, I had no idea they packed both BC and WF into the game. Isn't the a waste of space. ;\
It's most likely that Nintendo programmed both areas into the game, then blocked out White Forest on Black and Black City on White. Your game probably glitched the warp and sent you to White Forest instead of Black City.