bryron and his pokemons are brozor, stelix and bastiodon.
Canalave City Gym
the sixth gym is in canalave city
fire and ground
One of your Pokemon has to learn surf.
Byron in Canalave City is the sixth gym leader in Pokemon Diamond. He specializes steel-type. His 3 pokemons are Bronzor, Steelix, and Bastiodon.
byron the sixth gym leader u fight him in canalave gym
Your friend doesn't have a dad in the game, but Roark does (first gym battle). His name is Byron (sixth gym battle)
After you beat the sixth gym leader, you are allowed to use strength which moves the boulders.
The Canalave City Gym is the 6th gym. To get there, you must Surf west from Jubilife City. Get HM03 Surf in Celestic Town.
you go to heartom city and meet fantina in the gym PS you have to go on the elevator up
The sixth gym AKA the fortree city gym specializes in Flying Type Pokemon.
The Fortree gym.
you need to use a strong fighting type like a lucario or medicham