At Mavile city
The third gym leader in Pokemon Sapphire is Wattson and he is located in Mauville City.
You get the third badge in sapphire when you get to Mauville. You have to battle Gym Leader Wattson in the Mauville City Gym.
In Ruby, Sapphire and Emerald, the 3rd Gym Leader is in Mauville City and in Diamond, Pearl and Platinum, the 3rd Gym Leader is in Veilstone City.
the third gym leader wattson.
Defeat the 3rd Gym Leader, Wattson, in Mauville City.
In sapphire, the 5th gym leader is your dad, in that city after Oakdale.
The 6th gym leader in Pokémon Sapphire is found at the Fortree Gym. The name of the gym leader here is Winona.
You have to Dive and then you can battle the Gym Leader.
The 8th Gym Leader in Pokémon Sapphire can be found in Sootopolis City.
In diamond and pearl, veilstone city in ruby,sapphire and emerald, mauville city
The third gym leader is Whitney.
In the Lavaridge Town gym.