The third Gym Leader in Pokémon HeartGold who is Whitney the Goldenrod City Gym Leader, she'll be in the Radio Tower when you arrive in the city. You have to get the Radio Card for the PokéGear before you can battle her.
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The third gym leader in poekmon pearl is maylene, a fighting type gym leader.
The Mahogany City gym leader is not in Cianwood. He is in the gym in Mahogany, not anywhere else.
He is in the cave on Seafoam Island, which is east from Cinnabar.
After you defeat her, you will automatically register her in the Pokegear.