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The game starts in Nuvema Town in the player's room with Cheren, a childhood friend. Professor Juniper has left a gift box for the two and Bianca, another one of the player's friends, who arrives a little later. The box contains three Pokémon that the player can choose from. After the selection, Bianca will request a battle. When the battle is over, the room becomes cluttered due to the battle. Cheren heals both the player's and Bianca's Pokémon, and begins a battle with the player as well. If the player loses to Cheren, he will gloat about his victory. The three then go downstairs, and Cheren and Bianca will leave the house while the player's Mom will heal the Pokémon.
The player visits Bianca's house, where she and her father are having an argument about her going on a Pokémon journey. Bianca storms out of the house, and the player follows her to Professor Juniper's lab, where Cheren has been waiting. In the lab, Professor Juniper will give the player a chance to nickname the selected starter Pokémon, and give each of the three a Pokédex. Upon leaving the lab, they will be greeted by the player's mother, who will hand everyone a Town Map.
From then on, the player will set off on adventures through the Unova region. Along the way, the player, Cheren, and Bianca will battle eight Gym Leaders, while trying to complete the Pokédex. After managing to obtain all eight Badges, the player will head to the Pokémon League to battle the Elite Four and the Champion. Cheren decides to pursue strength and Bianca realizes that she cannot match the skills of the player or Cheren.