Sure you can. In ruby, the third gym leader leaves his gym.
The third gym leader in poekmon pearl is maylene, a fighting type gym leader.
The 6th Gym Leader in Pearl is Byron who is in Canalave City.
were is the fifth gym leader
The seventh gym leader
She is in Hearthrome City, in Platinum she is the 3rd gym leader.
Byron in the canalave gym.
3rd gym
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The 8th gym leader is in sunny shore city
go to hearthome city and fight the gym leader there
Beat the GYM LEADER [=
at the sunny shore gym