Mossdeep Gym

In Ruby and Sapphire, the Gym's floor is covered with tiles similar to spin tiles 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 reach Tate and Liza 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 spin tiles 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 spin tiles, the player is unaffected by them.

At least one of the Gym Trainers must be battled in order to reach Tate and Liza.

In Omega Ruby and Alpha Sapphire, the Gym is entirely redesigned. Platforms are connected by strings of energy orbs that automatically direct the player between them. The player must inspect stones on the various platforms to change which orbs are lit up, and thus which paths they can take through the Gym.

When defeated, Tate and Liza will give the player the Mind Badge as well as TM04 (Calm Mind) as a reward.

Trainer	Pokémon
Psychic Preston ヒロム Hiromu Reward: 888	Kirlia♂ Lv.37 No item
Psychic Maura ヒカリ Hikari Reward: 864	Kadabra♂ Lv.36 No item
	Kirlia♀ Lv.36 No item
Psychic Samantha ミライ Mirai Reward: 888	Xatu♀ Lv.37 No item
Psychic Fritz サトル Satoru Reward: 840	Natu♂ Lv.35 No item
	Girafarig♂ Lv.35 No item
	Kadabra♂ Lv.35 No item
Psychic Virgil ユウヤ Yūya Reward: 864	Ralts♂ Lv.36 No item
	Kadabra♂ Lv.36 No item
Psychic Hannah アスカ Asuka Reward: 864	Ralts♀ Lv.36 No item
	Kirlia♀ Lv.36 No item
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.

Tate and Liza use four Hyper Potions.

Leader Tate & Liza Mossdeep Gym Ruby and Sapphire Reward: 8400
Types: Rock Psychic Ability: Levitate Held item: None Lunatone Lv.42 Light Screen Psychic   --       Psychic Psychic   --       Hypnosis Psychic   --       Calm Mind Psychic   --       Types: Rock Psychic Ability: Levitate Held item: None Solrock Lv.42 Sunny Day Fire   --       SolarBeam Grass   --       Psychic Psychic   --       Flamethrower Fire   --

Trainer	Pokémon
Entrance room
Psychic Preston ヒロム Hiromu Reward: 864 Potential Double Battle with Maura	Kirlia♂ Lv.36 No item
Psychic Maura ヒカリ Hikari Reward: 864 Potential Double Battle with Preston	Kadabra♂ Lv.36 No item
West-central room
Psychic Samantha ミライ Mirai Reward: 864 Potential Double Battle with Blake	Xatu♀ Lv.36 No item
Psychic Blake サトキ Satoki Reward: 864 Potential Double Battle with Samantha	Girafarig♂ Lv.36 No item
Southeast room
Psychic Macey フサコ Fusako Reward: 864 Potential Double Battle with Clifford	Natu♀ Lv.36 No item
Gentleman Clifford スティーブ Steve Reward: 2880 Potential Double Battle with Macey or Kathleen	Girafarig♂ Lv.36 No item
Hex Maniac Kathleen ユキヨ Yukiyo Reward: 864 Potential Double Battle with Clifford or Nicholas	Kadabra♂ Lv.36 No item
Psychic Nicholas リョウイチ Ryouichi Reward: 864 Potential Double Battle with Kathleen	Wobbuffet♂ Lv.36 No item
Northwest room
Gentleman Nate トニー Tony Reward: 2880 Potential Double Battle with Virgil	Spoink♂ Lv.36 No item
Psychic Virgil ユウヤ Yūya Reward: 864 Potential Double Battle with Nate or Slyvia	Ralts♂ Lv.36 No item
Hex Maniac Sylvia アサヨ Asayo Reward: 864 Potential Double Battle with Hannah or Virgil	Meditite♀ Lv.36 No item
Psychic Hannah アスカ Asuka Reward: 864 Potential Double Battle with Sylvia	Kirlia♀ Lv.36 No item
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.

Tate and Liza use four Hyper Potions in the Gym battle and three Full Restores in the rematches.

Leader Tate & Liza Mossdeep Gym Emerald Reward: 8400

Types: Ground Psychic Ability: Levitate Held item: None Claydol Lv.41 Earthquake Ground   --       AncientPower Rock   --       Psychic Psychic   --       Light Screen Psychic   --       Types: Psychic Flying Ability: Synchronize Held item: None Xatu♂ Lv.41 Psychic Psychic   --       Sunny Day Fire   --       Confuse Ray Ghost   --       Calm Mind Psychic   --       Types: Rock Psychic Ability: Levitate Held item: Sitrus Berry Lunatone Lv.42 Light Screen Psychic   --       Psychic Psychic   --       Hypnosis Psychic   --       Calm Mind Psychic   --       Types: Rock Psychic Ability: Levitate Held item: Sitrus Berry Solrock Lv.42 Sunny Day Fire   --       SolarBeam Grass   --       Psychic Psychic   --       Flamethrower Fire   --

In Pokémon Masters EX, Mossdeep Gym is seen in artwork related to both Tate and Liza.