Pokémon Ruby and Sapphire/Mossdeep City

Mossdeep City is where you find the seventh Badge.

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

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

Psychic Preston
 * Kirlia: Level 37

Psychic Maura
 * Kadabra: Level 36
 * Kirlia: Level 36

Psychic Samantha
 * Xatu: Level 37

Psychic Fritz
 * Natu: Level 35
 * Girafarig: Level 35
 * Kadabra: Level 35

Psychic Virgil
 * Ralts: Level 35
 * Kadabra: Level 36

Gym Leaders Tate and Liza (Simultaneous)
 * Lunatone: Level 42 and Solrock: Level 42