Mauville city
The 4th gym, is located in Lavarige town. However, team Magma is blocking the way to the Cable Car. Travel into mt. Chimney via the opening just west of the cable car entrance. Continue north battling the fire types and for some reason, machops. exit. Continue east, then north again once the path Forks (to the south lies the Desert, to the north lies Fallarbor). Follow the natural road now turning west. Trek thru the soot covered landscapes and land in Fallarbor. ask around, and find out that the local scientist was captured my team magma. Save him in Meteor falls, south west of Fallarbor. Now comes the moment you have to travel BACK to the cable car and then go to the top of Mt. Chimney. Take on team magma. you are finally free to travel South down Mt. Chimney, and to Lavarige, where the 4th gym resides.
by beating the fourth gym leader
All
easy as pie beat the gym leader with strong enough Pokemon
Flannery, a fire type gym leader.
lavadridge town past route 112
The fourth gym is located in Lavaridge Town,past Mt.Chimney on Route 112.
maybe..defeat the fourth gym leader(Norman)..
The fourth gym is the fire gym in fallorbar town.
The fourth gym in pokemon emerald is a fire gym in lavadrige city led by Flannery. She has a numel, slugma, camerupt and a torkoal. If you beat her she will give you a TM50 overheat. So I suggest that you brign water pokemon with you as a counter.
Simple use a water, ground or rock type Pokemon at the fourth gym
you go to Petalburg city gym to get your fourth bage and surf
Lavaridge town. It's a fire type gym so take lots of water ones with u