After conquering Flannnery at the Lavaridge Gym, return to Petalburg. There you shall find the Petalburg Gym and within its walls, Norman the fifth Gym Leader. For future reference, he is a fairly easy trainer to beat but his Pokemon have rather high defensive capabilities as well as a lot of health so be sure to bring your strongest Pokemon. Do not attempt to inflict status conditions on his Pokemon either because all of them know the move facade, which doubles the amount of damage inflcited if they are suffering from a status condition.
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Try his perents house
In the 8th gym. he is the gym leader
The gym leader is not at the gym and that is why we cannot enter the gym.
The 6th Gym Leader In Pokemon Ruby Destiny is in Down Pour City
Beat the Gym Leader