After beating Fantina in Hearthome City, Pokemon Brilliant Diamond & Shining Pearl players will need to make their way over to Canalave City, which can be found in the east of the Sinnoh region. To reach the city, players will need to use their newly-acquired Surf hidden machine, as it can only be accessed by crossing the water on Route 218. There's not much to do there when players first arrive, so, after a quick rival battle, they'll be able to head straight to the city's gym to take on its leader, Byron.