Apparently, the game says the pokemon change as the people change and I have NO idea how to change them. Help?
The population plays an important part in the growth of the forest, the Pokémon residing within it, and items dropped. In order to expand the forest and get more Pokémon and items, you'll need to use the Entralink to visit another player's Black City and invite characters over. At maximum population (ten characters), White Forest has lush tall trees, abundant grassland, and gleaming water surfaces. When very few people are around, the grassland is sparse, there are fewer, smaller trees and fewer or no water surfaces.
You need 2 DS systems and one of the DS needs Pokemon White and the other one will have Pokemon Black.