Mossdeep was the ideal location to build a space center which launches huge rockets because of the stable weather conditions. The Space Center is successfully sending rockets into space.
The possibility of rare stones in the cavern has attracted the attention of Steven Stone, who owns a cottage here where he keeps part of his rock collection.
The gym is run by twins Tate and Liza who specialize in double battles and psychic Pokémon. When defeated, Tate and Liza will give the player the Mind Badge.