This is a list of the Pokémon from the Unova region in Pokémon Black & White. In a break from tradition, the Unova Pokédex here only contains the 156 new Pokémon from the region. You can later obtain the National Dex which includes the other 493 Pokémon.
One difference to other games in the inclusion of a legendary Pokémon with Pokédex number #000: Victini. When Black/White was first released it was available quite early in the game through a wifi event. See also: The Black/White Pokémon stats page, or the Black 2 & White 2 Pokédex for the sequels.