Mosdeep City Surf there from Lilycove
The seventh gym badge in Emerald is located in Mossdeep City.
In Pokemon Sapphire, Ruby and Emerald the 7th Gym that's located in Mossdeep City has Psychic type Pokemon.
Water, dark and grass Pokemon
Press the switches to move around the statues and use the portals to the navigate your way to the gym leader's.
sootopolis city, after u awake rayquaza. the gym leader is juan, changed from ruby/Sapphire Wallace
Twins Liza and Tate in Moss deep City, they use physicic Pokemon
You have to surf from Lilycove to Mossdeep city so you can challenge the 7th Gym Leader, The psychic twins, Tate and Liza.
mossdeep city somwhere by the gym
The fourth gym is located in Lavaridge Town,past Mt.Chimney on Route 112.
After you have been through both the team magma and team aqua bases, the team aqua member to the east training wailmer should now be gone. You should then surf east until you reach Mossdeep City. The seventh gym is located on this island.
Roxanne is the leader of the Rustboro City gym.
mossdeep city, to get there, surf east from lilycove also it is a double battle because they are twins Gym Leaders Tate & Liza