sootopolis city, after u awake rayquaza. the gym leader is juan, changed from ruby/Sapphire Wallace
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.
The seventh gym badge in Emerald is located in Mossdeep City.
Twins Liza and Tate in Moss deep City, they use physicic Pokemon
get a pokemon, then you train it, get it really strong, and beat th ecrap out of all the 7th leader's pokemon. Its easy.
the seventh gym is at sekka city
You have to surf from Lilycove to Mossdeep city so you can challenge the 7th Gym Leader, The psychic twins, Tate and Liza.
there is no gym at pacifidlog
The Fortree gym.
In the mahogany gym
mossdeep city, to get there, surf east from lilycove also it is a double battle because they are twins Gym Leaders Tate & Liza