First you need to go to mt pyre and beat every grunt there and talk to the elderly. then go to the vulcano neart to lavaridge town and jump down the hills. Then a cave will appear. after you defeat maxie in that cave you can enter team aqua's hideout.
A rock in the front is a good hideout to pass em
You have to beat team aquas leader. His red orb will glow and kyogre will wake up.
you go to the team aquas hideout near lillycove city
beat the team aqua base
You must get the badge from your dad and when you do you get the HM surf and teach it to a Pokemon that knows how to do it. go to Lilcove and go all the way to the upper right and surf and you'll see a cave and that is Team aquas hideout!Welcome,Qajs1 (Quinton)
team aquas hideout in lilycove
look up walkthroughs on youtube
near team aquas hideout in sapphire. but in emerald it is on MT. chimeny
the master ball is in team aquas hideout. When u find the room with 4 pokeballs the one on the top left (I think) is the master ball.
you have to go to Mt. Pyre and stop them there first the go to the shoreline and surf up and the aquas that where standing there will be gone
wait at the main area until he comes around, then pounce!
lilycove city or something like that