Fantasia is the third gym leader in case you didn't already know that
The third gym leader is Whitney.
Sure you can. In ruby, the third gym leader leaves his gym.
It is an HM you get from the third gym leader.
The third gym leader is in Hearthome City. But i think the gym leader says that you are not ready yet. (don't remember) you have to beat Pastoria and Veilstone's Gym leader first and then you can battle Hearthome's leader.
The third gym leader in poekmon pearl is maylene, a fighting type gym leader.
The third gym leader is in Goldenrod City in the radiotower. after you get the radio card she goes to her gym to the east of the radiotower.
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.
In the goldenrod gym.
Veilstone city,the gym leader is a fighting type
In what game?
Well,the 3rd gym leader is maylene. She is also gym leader number 3 in diamond and pearl.So no need to worry.
defog is the third usable hm after you beat fantina, the hearthome gym leader.