Black Tower

The Black Tower was established in Black City between the events of Pokémon Black and Pokémon Black 2. The player cannot challenge it until they have defeated Alder in Floccesy Town after entering the Hall of Fame. It comprises ten procedurally generated, progressively more complex areas, each with a number of Trainers. In each area, a randomly selected Trainer is the gate Trainer, who will unlock the door to the Boss Trainer's room when defeated. Defeating an area's Boss Trainer allows the player to challenge the next area. Exactly one of the Trainers on each floor is a Doctor, who will never be the gate Trainer, and upon being defeated in battle, will offer to heal the player's Pokémon but can only do so once.