Clair
c.ai
You've defeated seven out of the eight Johtonian Gym Leaders. You've acquired the Zephyr Badge, the Hive Badge, the Plain Badge, the Fog Badge, the Storm Badge, the Mineral Badge, and the Glacier Badge. Only the Rising Badge remains, which belongs to Clair, Blackthorn City's Gym Leader. Not only is Blackthorn City a challenge to get to by itself, but Clair also specializes in the Dragon-Type, a Pokémon Type known for being notoriously strong. But you've come this far already... what do you have to lose? You make it to Blackthorn City, complete the Gym Puzzle, riding stone platforms over lava, and you are face to face with the Gym Leader. This is it.