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
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The first gym in Pokemon diamond is in Oreburgh City
in the forest by the 2 gym leader
go into oreburgh mine and talk to gym leader
easy if you want to challage the Pokemon leader you have to go to the light house and go to the top and find the gym leader then you challage the leader get the HM then you go to the Pokemon league
She's the gym leader of Hearthome City and an user of ghost Pokemon.