On the inside, the player will find teleport platforms scattered about. There are also a number of Grunts to take on, including the team's admin TabithaR or CourtneyOR who will tell the player that Maxie, the leader of Team Magma, has left with the submarine to the watery depths near Sootopolis City.
After finishing everything in the Hideout, the player is free to move onto Route 124 which was previously blocked by a Grunt trying to train his Wailmer. Route 124 connects to Mossdeep City.
In Ruby, after defeating Tate and Liza, the entrance to the hideout is sealed, meaning the player can no longer collect any items or battle any trainers inside. This is no longer true in Omega Ruby.
The Magma Hideout appeared in Gaining Groudon, where it was depicted as a large, mobile sea fortress. Having accidentally wound up on top of a Team Magma submarine, Ash and his friends were taken prisoner there, but they escaped in the confusion when Kyogre escaped from the hideout with the help of Team Aqua. Team Magma evacuated safely, but their hideout sank because of the huge hole in the side caused by Kyogre's Hyper Beam attack.
The Team Magma Hideout appeared in The Vision, where Brendan was seen infiltrating the base with his Sceptile, while Maxie and Tabitha boarded the modified Submarine Explorer 1 for the Seafloor Cavern. On Maxie's orders, Courtney stayed behind in order to stall Brendan. While waiting for Brendan, Courtney experienced a vision of PrimalGroudon attacking Team Magma. Despite this, she didn't let the vision disturb her as she started her battle with Brendan, giving the submarine enough time to depart for its destination.
In the manga
Magma Hideout in Pokémon Ruby-Sapphire
In the Pokémon Adventures manga
Team Magma does not have a set base in Pokémon Adventures. Instead, Maxie chooses the locations where the team's meetings are held on a whim.
Related cards Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.
In Pokémon Omega Ruby, the Project AZOTH files incorrectly state that Team Magma intends to return the world to the beginning, to its original state. That is actually Team Aqua's goal in Pokémon Alpha Sapphire, while Team Magma's objective is the exact opposite — to accelerate progress and development by creating more explorable land. It is unknown if this is an intentional or accidental error on the developers.