You can find the 2nd gym in the south part of Eterna City.
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where can i find the second gym in Pokemon platinum
The second gym leader in Eterna city
The first gym in Pokemon diamond is in Oreburgh City
go into oreburgh mine and talk to gym leader
She is the 5th, gym leader, you have to beat pastoria gym first the vielstone! then go back to harthome city and you can find her in her gym