Claire

After you have defeated Team Rocket in Goldenrod City and make it through the Ice Cave, you'll have access to the Blackthorn City Gym. Unlike the previous games, the Blackthorn City gym features a specific maze featuring platforms you need to move and rotate in order to get the path you desire. Once you reach the end of the Gym, you will encounter the Blackthorn City Gym Leader; Clair. However, after battling, you won't go to the badge and will have to make your way through the Dragon's Den before you can get it