the sixth gym is in canalave city
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The sixth gym is in Canalave City of Pokemon Pearl, west of Jubilife City.
The first gym in Pokemon diamond is in Oreburgh City
you go to the lake to battle team galatic and then you go to snowpoint city to get your seventh badge.
The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
The sixth gym badge (the Marsh badge) is located at Saffron City's gym. It is in Gym Leader Sabrina's possession, so you have to defeat her to obtain it.