You go to fortree city. HOWEVER, u cant go to it. so keep crossing the bridge to the right. And just make ur way through. Eventualley a guy will give u something so u can get through the ivisible thing to get to the gym. ( u will get what im talking about) ;)
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the third badge in sapphire is at mauville city(north of slateport city)
In Pokekon Sapphire, you get the 5th badge after defeating your opponent in a Gym Battle at Petalburgh.
in lavarage town
The fifth badge is in Sootopolis City, you need Surf, Dive, and Whirlpool to get it
You get in right before getting the last badge.