There is no way to really become a leader in pokemon. With AR you might be able to stand in as a leader, but you are never a real leader, and it is impossible without AR.
No
NO retard
The 6th Gym Leader in Pearl is Byron who is in Canalave City.
were is the fifth gym leader
The third gym leader in poekmon pearl is maylene, a fighting type gym leader.
NO
He is the leader of team galactic
Wext.
In pokemon diamond and pearl
electric type Pokemon
harthome city harthome
Beat the gym leader