The 6 gym leader in at Canalave City. the gym after the hearthome City gym!!!!!
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The first gym in Pokemon diamond is in Oreburgh City
After beating the third Gym Leader (Maylene the Veilstone Gym Leader) in Pokémon Diamond, you then head to Pastoria City to battle the Gym Leader there who is named Crasher Wake.
go into oreburgh mine and talk to gym leader
Well,the 3rd gym leader is maylene. She is also gym leader number 3 in diamond and pearl.So no need to worry.
a gym leader can't teach a Pokemon that move but you have to defeat the 6 gym leader in order to teach that move