The first gym is in pewter city.
The first gym in Pokemon diamond is in Oreburgh City
by beating the gym leader
The first gym leader is in a town called RustBoro City
it depends on the Pokemon that you have, i have pikachu and shocked everyone that stood in between me and the gym.
The first Gym is Roxanne's Gym. Her Pokemon are Geodude and Nosepass, level 14 and 15.
The first gym is in pewter city.
The poisonous gym of Koga's command in Fuchsia city comes first in Pokemon fire red and in Pokemon leaf green
The first gym in Pokemon diamond is in Oreburgh City
FIRST YOU HAVE TO GET PAST THE PETALBERG WOODS THEN YOUR ATTHE GYM
the first place where you see him after you get your first pokemon.
You first must make sure that the gym leader is in the gym, because in some games you have to locate the gym leaders first. After that, you may have to get through a puzzle in the pokemon gym to get to the gym leader at the end of the puzzle. After that, you will battle the gym leader, and if all of her Pokemon faint, then you will probably be given a gym badge.
the first gym is at orebough city
by beating the gym leader
The first Gym is in Rustboro city. Which is by the tunnel to Verdanturf.
The first gym leader is in a town called RustBoro City
In Pewter City, the first gym leader is in the gym. His name is Brock, and he specializes in Rock-type pokemon. His first pokemon is a Level 12 Geodude, followed by a Level 14 Onix.