The third gym leader in Pokemon black is in Castelia City. He uses mostly bug-type Pokemon and his name is Burgh. Hes also a veeery good artist. Whenever he gets artists block, he goes to Nacrene City for inspiration. Hope this helped you! :D
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The third gym leader in poekmon pearl is maylene, a fighting type gym leader.
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.
Well,the 3rd gym leader is maylene. She is also gym leader number 3 in diamond and pearl.So no need to worry.
in the museum
Lenora, the second gym leader, is found in her gym AKA the museum in Nacrene City.