In Pokémon Black and Pokémon White
Bianca is one of the hero's two rivals and childhood friends. In the game, she chooses the Starter Pokémon that has a type disadvantage against the hero's starter, and is also the hero's first trainer battle.
Bianca has a desire to explore and learn about the world, though her father does not want her to. After some convincing from Gym Leader Elesa, her father decides it is alright for Bianca to explore with her Pokémon. Bianca takes a liking to Professor Juniper, and begins to take the role of Juniper's assistant in the field. Unlike Cheren, she does not seek power or strength.
In Pokémon Black 2 and Pokémon White 2
In Black and White 2, Bianca has become Juniper's assistant. She provides the hero and his or her rival with their Starter Pokémon.
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