the same as ruby and sapphire versions. in order: 1st gym: rustboro city 2nd gym: dewford town 3rd gym: vendruff 4th: Lavaridge Town 5th: petalburg 6th: fortree 7th: Mossdeep 8th: Sootopolis City
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...you beat the gym leaders
after you beat 4 to 5 gym leaders you can face him
you build up your Pokemon higher than the gym leaders and the you kill the gym leaders Pokemon and as they all faint you will get a badge and you have to move on to nuger 4 gym leader
you can only rebattle gym leaders when you have defeated the elite four, check your match call on the pokenav when you have
It is on Mossdeep City. There are Twin Gym leaders