Mossdeep City (Japanese: トクサネシティTokusane City) lies on an island along the eastern edge of the Hoenn mainland. Many divers live at Mossdeep, and it is the fourth largest city in Hoenn. One of the city's attractions is Wailmer watching. A deep underwater trench runs between Mossdeep City and Sootopolis City. This cavern was found by Captain Stern in his submarine. Mossdeep City has a Pokémon Gym whose Gym Leaders are Tate and Liza.
The island of Mossdeep is covered in plants and flowers. Its weather is mainly sunny, and its winds are stable. This clear weather made Mossdeep the ideal location to build a space center to launch large rockets. In Mossdeep, there is a white rock which holds a special meaning to the people at the space center. They placed the rock outside of the space center as a symbol of their wish for their rockets to fly safely. After entering the Hall of Fame, the player can obtain a level 5RSE/1ORASBeldum from Steven's house.
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. In Emerald, the Space Center plays a big part in the plot, where Team Magma attempts to steal rocket fuel while a rocket begins to launch into space. On the second floor, the player will meet with Steven and battle two Team Magma Grunts.
The Space Center also plays a key role in the Delta Episode of Omega Ruby and Alpha Sapphire. A Kecleon hides behind the astronaut cut out on the bottom floor in after the Delta Episode. This Kecleon has its hidden ability Protean.
The house west of the Pokémon Center houses a brother and sister. The boy likes to visit people's Secret Bases.
In Pokémon Ruby, Sapphire, and Emerald, the boy will tell the player where their Secret Base is located.
In Pokémon Omega Ruby and Alpha Sapphire, the boy tells the player that they can access additional areas in Secret Bases with Stairs and Solid Boards.
Pokéblock enthusiast's house
The house north of the Pokémon Center houses a couple. The man is a Black Belt who is very enthusiastic about Pokéblocks.
In Pokémon Ruby, Sapphire, and Emerald, he will tell the player the preferred color of Pokéblock of the player's lead Pokémon.
In Pokémon Omega Ruby and Alpha Sapphire, he serves no purpose, simply telling the player that their lead Pokémon likes them more than Pokéblocks.
Backdoor house
In Pokémon Ruby and Sapphire and Pokémon Omega Ruby and Alpha Sapphire, these is an old man with a house with a door on the back wall.
In Pokémon Ruby and Sapphire, e-Reader Trainers will appear in the back room.
In Pokémon Omega Ruby and Alpha Sapphire, the old man mentions he used to be a Secret Base Expert. If the player scans the QR Code of a special Secret Base (such as those of Junichi Masuda, Shigeru Ohmori, Shigeki Morimoto, and Shōko Nakagawa), it will appear behind this door.
In Pokémon Ruby and Sapphire, the population of Mossdeep City is 45. Despite it being on an island in the middle of the sea, its population is fairly large, and it is Hoenn's fourth most populous city.
Pokémon Emerald
In Pokémon Emerald, the population of Mossdeep City is 52, making it Hoenn's fourth most populous city.
In Generation III, Mossdeep is the only location in Hoenn where the rare Net Ball and Dive Ball are sold. However, they are no longer sold here in the remakes.
class="roundybottom" style="background: #Template:City color light; color: #000000" colspan="14" | A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
Generation VI
class="roundytl" style="padding-left: 1em; padding-right: 1em; background: #Template:City color light; color: #000000" rowspan="1" | Pokémon
style="padding-left: 1em; padding-right: 1em; background-color: #Template:City color light; color: #000000" rowspan="1" colspan="6" | Games
class="roundybottom" style="background: #Template:City color light; color: #000000" colspan="14" | A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
In Dreams of the Sun and Moon!, Sophocles mentioned that he had plans to visit Mossdeep City and the Mossdeep Space Center with Molayne during the upcoming vacation. They departed for said vacation in the next episode. In JN037, Sophocles was revealed to have returned to Alola from his trip, although he was planning to visit the Space Center again in the future.
According to the anime, Mossdeep City is located on Mossdeep Island. As mentioned in Judgment Day! and Clamperl of Wisdom, ferry services run between Mossdeep and some of its neighboring islands, as well as Lilycove City.
Mossdeep City made a couple of brief background appearances during The Cavern. It also briefly appeared in The Scoop, with the episode's focus being mainly on the Mossdeep Space Center.
In the manga
In the Pokémon Adventures manga
Mossdeep City was the setting of two flashbacks in the Omega Ruby & Alpha Sapphire arc. In the first flashback, Steven arranged a meeting in his house with Ruby and Emerald, where the two learned about a meteor's impending impact with their planet. After telling the two about his father's plan and their awareness of opposition to it, Steven also gave Ruby and Emerald a Mega Bracelet each, as well as an additional Mega Bracelet to pass to Sapphire. In the second flashback, Ruby and Emerald were at the Mossdeep coastline after their meeting with Steven. Ruby then used Courtney's memory lighter to investigate Steven's potential enemy.