Go north of Mauville and then west and you will see fences. Over there you will see the next gym, but you need to fight your way there through Team Magna or Team Aqua on that volcano.
Yous should have flash now. Take the boat back, and use flash on the cave where you couldn't see before, and then you go to Mauville City.
The Hearthome City gym is a Ghost-type gym which is the 5th gym in Diamond and Pearl and the 3rd gym in Platinum. The gym leader is Fantina, who uses a Drifblim, Gengar, and Mismagius in Diamond and Pearl and a Duskull, Haunter, and Mismagius in Platinum. Defeating her gets you the Relic Badge.
You will have to battle Juan in Sootopolis City. Before you able to go to the Gym located in the center of the city, which is shaped in a circle, you must go to the Cave of Origin and battle a Pokemon there.
yes titanic did have a gym on board
it is in mauville city it is in mauville city
Get Rock Smash in Mauville and head north!
MAUVILLE
You get the third badge in sapphire when you get to Mauville. You have to battle Gym Leader Wattson in the Mauville City Gym.
it is Mauville gym
mauville city
First beat the Mauville Gym leader, Wattson.
mauville city gym leader wattson
first,talk to the gym leader at mauville(he will be out side the gym)then he will tell you about new mauville,then he will give you the basement key.second,you need to go to the river in front of the trick house and use surf and go forward.you will see a cave.go in and you are new mauville!
on mauville city
it is on mauville city
in mauville city