go to the dive spot surrounding a cave. (not the white cave) then, go in. see the submarine? press b here and you'll get to seafloor cavern. (make sure your Pokemon knows strengh) you'll battle some team magma grunts, then battle the magma boss again. win then he'll use the blue orb, causing groudon to flee. then, steven appears and you have to go to sootoplis. go in the cave of orgin to find groudon. catch or defeat it because that's all you can do at this point. i defeated it one-hit KO because i had no pokeballs. to use dive, beat mossdeep city gym leaders tate and liza.
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you will go to lavaridge town again from cablecar and then go to south the ground will shake and there will be a hole and you will enter the magma hideout
In Emerald, an old lady in Mt. Pyre will give you Magma Emblem. After you got it, go to Judged Pass. If you bring the Magma Emblem, the Magma Hideout will appear in Judged Pass.
Judged Pass
Team Magma boss Maxie in their hideout in the cave by Lilicove's shore
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.