"Pokémon Black and White" are role-playing video games released for the Nintendo DS in 2010. They are part of the Pokémon series and introduce players to the Unova region, featuring 156 new Pokémon species. Players take on the role of a Pokémon Trainer, battling other trainers and gym leaders to become the Champion. The games emphasize a storyline that explores themes of truth and ideals, primarily through the conflict between the villainous team, Team Plasma, and the player. Players can trade and battle with others, and the games also introduced new gameplay mechanics, such as triple battles and seasonal changes.