In Pokemon Crystal, the player begins as a young Trainer in the Johto region, receiving a first partner Pokemon from Professor Elm before setting out on a journey. Traveling through Johto's towns and wilds, the player catches and trains Pokemon while aiming to earn the region's eight Gym Badges and take on its most skilled Trainers. A determined rival, who took one of Professor Elm's Pokemon, resurfaces throughout the adventure to challenge the player, and the criminal organization Team Rocket reappears with plans of its own. The player explores a world full of wild Pokemon while uncovering the region's secrets.