go to enterna city
Find ALL the trainers beat them all, and then fight the Gym Leader at the front.
gardenia - grass type
The seventh gym leader is Candice, the Ice Type leader. She is at Snowpoint City.
sunyshore city
you find her in the old chateau
The third gym leader in poekmon pearl is maylene, a fighting type gym leader.
go to a city and find the gym leader's building.(some cities don't have gym leaders)
it is in hearthome city
find all the other trainers in the gym
eterna city gym leader gardenia she uses grass types
The 6th Gym Leader in Pearl is Byron who is in Canalave City.
Simple. You need to beat the gym leader in Eterna City. She is only the second gym leader and her Pokemon are fairly easy.