Ur 3rd city iz Hearthome city but da gym leader iz actuly not da 3rd gym leader she iz da 5th gym leader.Ur 3rd gym leader iz Maylene in Veilstone city.
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 Ruby, Sapphire and Emerald, the 3rd Gym Leader is in Mauville City and in Diamond, Pearl and Platinum, the 3rd Gym Leader is in Veilstone City.
I have Pokemon platinum the 3rd gym leader always their your probaly just not lucky.
to beat the third gym leader use an ground and flying and water and dark type it worked for me trust it!!!!! I pitty da fool!
The third gym leader is Whitney.
Viel stone cityMaylene is in her gym, you have to complete the simple puzzle within to gain access to her.
Beat Maylene then, Wake. (Crasher Wake). Then,go to Celestic town. Then, battle her.
The 6 gym leader in at Canalave City. the gym after the hearthome City gym!!!!!
In diamond and pearl, veilstone city in ruby,sapphire and emerald, mauville city
Fantasia is the third gym leader in case you didn't already know that
if you mean the gym in eterna, it's the 2nd gym and you have to beat all the trainers. The 3rd gym is in vielstone city