U go to the magma hideout and defeat Maxie
i don't know but i remember that you can access the Magma Cave/Hideout in order to battle Maxie / or even not. I think after you defeat Maxie, it is closed. But i Already Finished Pokemon Emerald..
No only in aqua's hideout.
First, you have to defeat the Aqua team at Mount Prye, then you have to defeat the Magma team at their hideout near Lavaridge. Then, the guard will be gone.
in magma hideout
Team Magma/Aqua's hideout is east of Lilycove City. You have to surf north from the beach to get there.
You can find it in he Magma or Aqua hideout.
Team Magma Hideout
Judged Pass
in a bush
U will need a water Pokemon like tenticrul
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