in Mossdeep: surf to right from Lilycove until you get there.
They use Psychic types. The leader is a double battle (freakish psychic twins). They use: Solrock, Lunatone, Natu, Claydol.
In 7th gym
mossdeep city
In Pokemon Sapphire, Ruby and Emerald the 7th Gym that's located in Mossdeep City has Psychic type Pokemon.
Tate & Liza in Mosdeep. Psychic type.
after defeating the 7th gym leader
Any Pokemon with ice or electric moves
You go to Sky Pillar after the 7th gym in Emerald. There are only 8 gyms.
the 7th gym is in mossdeep city
first you deafeat the 7th gym then meet him at the space center
The Fortree gym.
there is no gym at pacifidlog
The seventh gym badge in Emerald is located in Mossdeep City.