You can challenge the petalburg gym after you beat fire type gym leader in lavaridge town.
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You must get 4 badges before you can challenge the Petalburg City Gym.
Petalburg City.
The fifth gym is in petalburg city
You battle Norman, the Petalburg City Gym Leader after you defeat Roxanne, Brawly, Wattson and Flannery in their Pokémon Gyms.
petalburg city gym. That is the one where you 'Dad' is the gym leader. hope this helped.