In Ruby and Sapphire, the Gym's floor is covered with tiles similar to spinners that whisk the player across to another area of the Gym when stepped on. Pulling switches changes the direction certain tiles point, allowing the player to access the Gym Leaders when all the switches are pulled. A warp tile next to them warps the player back to the entrance.
In Emerald, the Gym is similar to Saffron Gym in that it is a series of rooms connected by warp tiles. Each room contains Trainers and obstacles on spinners that rotate when certain tiles are stepped on, changing the path and often bringing the sight of enemy Trainers in-line with the player. Mossdeep Gym is the only Gym in Emerald to change its gimmick so drastically. Also, although other Trainers and statues spin on the spinners, the player is unaffected by them.
When defeated, Tate and Liza will give the player the Mind Badge as well as TM04 (Calm Mind) as a reward.
Trainers with a PokéNav by their names will be registered in the Trainer's Eyes or Match Call function after the first battle, and may have a rematch with the player with higher-level Pokémon.
Trainers with a PokéNav by their names will be registered in the Trainer's Eyes or Match Call function after the first battle, and may have a rematch with the player with higher-level Pokémon.
Trainers with a PokéNav by their names will be registered in the Trainer's Eyes or Match Call function after the first battle, and may have a rematch with the player with higher-level Pokémon.
The Mossdeep Gym appeared in It's Still Rocket Roll to Me! and Solid as a Solrock. In the anime, the Gym has multiple planet-like objects floating in the air, making the battlefield three-dimensional.
Ash originally met Tate and Liza having a battle in a zero-gravity room, and was surprised to find out that there were two Gym Leaders in one Gym. After Max and Tate had saved the space shuttle from being stolen by Team Rocket, Tate and Liza agreed to battle Ash. For the battle against Lunatone and Solrock, Ash chose Pikachu and Swellow, the latter in order to counter Lunatone and Solrock's ability to float in the air.
However, in the middle of the battle, Team Rocket showed up with their new robot, and stole Lunatone and Solrock. With Ash and his friends' help, the two Pokémon were recovered, but due to the Gym getting devastated by the robot, the interrupted battle was finished outdoors instead.
Trivia
In Pokémon Emerald, Mossdeep Gym is tied with Lumiose Gym for the highest amount of common Trainers out of all Gyms in the series, with twelve.
Mossdeep Gym is the only Gym where the Gym battle is a Double Battle.
