Defeat the 3rd Gym Leader, Wattson, in Mauville City.
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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
Flannery's gym in Lavaridge Town.