Pokémon Ruby and Sapphire/Mossdeep City

Mossdeep City is where you find the seventh Badge, as well as a few other useful items. Be sure to visit the northeastern house to obtain the Super Rod, as well as the northwestern one for HM08, Dive.

Space Center
Go inside the Space Center to get the Sun Stone, which will allow you to evolve certain Pokémon.

Pokémon Gym #7
There are Psychic-Type Pokémon in this Gym.
 * Prize: Mind Badge
 * Gym Leaders: Tate and Liza


 * Psychic Preston
 * Psychic Maura
 * Psychic Samantha
 * Psychic Fritz
 * Psychic Virgil
 * Psychic Hannah
 * Gym Leaders Tate and Liza (simultaneous)
 * [Emerald]
 * [Emerald]
 * Psychic Virgil
 * Psychic Hannah
 * Gym Leaders Tate and Liza (simultaneous)
 * [Emerald]
 * [Emerald]
 * Psychic Hannah
 * Gym Leaders Tate and Liza (simultaneous)
 * [Emerald]
 * [Emerald]
 * [Emerald]
 * [Emerald]
 * [Emerald]
 * [Emerald]

People

 * Tate & Liza
 * Steven Stone
 * Nurse Joy