by winning a contest and by defeating the pastoria gym leader
Go to the lighthouse and the Gym leader should be there.
go into oreburgh mine and talk to gym leader
The first gym in Pokemon diamond is in Oreburgh City
I think you get it from a gym leader
You can find the fifth Gym Leader in Hearthome City. Her name is Fantina.
The Pokémon the second Gym Leader has in "Diamond" are Cherubi, Turtwig and Roserade.
i think the 2nd gym leader is in Jublife or Oreburgh city.
in the grass in the last city the 8th gym leader
The 6th gym leader is in Canalave City.
You can only battle Hearthome City's gym leader Fantina after you have defeated Pastoria City's gym leader, Crasher Wake.
you beat the gym leader
He is in the lighthouse