This was the first Pokemon film commercially released in American theaters since Pokémon Heroes (2002), appearing in 375 locations over the weekend of December 3 through 4, 2011.
Reshiram and Zekrom are based on the yin yang, which in itself symbolizes the balance between opposites.
Victini as a Pokemon was created specifically for this film. This is the first time in the history of the franchise this has been the case; previously, any Pokemon stars in films were created first, and ideas for the films came afterwords.
Some American theaters gave away goody bags to anyone who went to see the film. The bags' contents included a movie sticker, a jumbo Victini trading card, the first chapter of the Black & White manga, and a code one could scan to get Victini in a Nintendo 3DS Pokedex game.