If your talking about the hideout when they launch the submarine then you go to the deeP sea cavern and beat their leader and you can attempt to catch groundog(Idk how to spell it) then you go to the elite for and beat the elite four, this is when you pretty much beat the game, granted there are a few minor details I missed such as getting the last couple badges and such....... If your like me then you'll wanna catch all the rare and legendary pokemon as well which can make the game abit longer
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Team Magma boss Maxie in their hideout in the cave by Lilicove's shore
you get it in team aqua/magma's hideout in lilycove
There is a master ball in the Team Magma's hideout in Pokémon Ruby Sapphire, and Emerald. Look in the Hoenn region for the Team Magma's base of operations.
theres one materball in team magma/aqua hideout
in their hideout in lilycove. surf on the sea and get in the big rock, there is also the submarine.