I GOT THIS
Similar to other parallel series, there will be a couple differentiations in Pokemon throughout the game, so you'll have to trade with someone with the other version if you want to get them all. The eighth gym leader is different in each game Shaga and Iris, although they both use Dragon type Pokemon. There will be locations unique only to each game, White Forest and Black City. And lastly Pokemon White will have more triple battles and less rotation battles, whereas Black will have more rotation and less triple.
i has a dark city and the other has a forest of light or summthink like tht lol
Probably some different types of Pokemon... Lol