You beat team aqua in the place where everthing is blocked of but you need a shovel
you are supposed to beat team aqua to get into in team aqua's hideout you are supposed to beat team aqua to get into team aqua's hideout in lilycove city
you go to mount. chimney go down the side and a new cave will open up and it is a team magma hide out when you beat them go to saleport then when team aqua takes the submarine got back to team aqua hideout and beat them then they will go away also team aqua hideout is where you get a masterball
simple you go to mossdeep city vis surf beat tate and liza then help steven beat team magma in the space place at the northeast of the city and then go into all houses until you reach Stevens house and use dive to find the seafloor cavern and beat team aqua
you beat the boss
Surf east from Lilycove to go to Mossdeep City.
you just need to find it and beat team aqua.so you can go to Mossdeep city.
he is at the top of team aqua HQ, after you beat him you get the master ball
beat the team aqua base
Beat Team Aqua at MT Pyre first.
go to the top of mt piye, beat all the team aqua up there (but if u have emerald u have to go to firey path and sreach the area and beat, obtian item in the base there, beat maxtie), then go to slatport city, go to the port there and u will see cap'n stern benn interveiwed, talk to him, then you will hear team aqua talking on the mic, go inside and go near team aqua and they will go to their base in lilycove. beat, warp and obtain items in that base(there is a master ball in there somewhere), go outside and the walimar will not be there. Thanks!!
beat their boss in slaterport
You have to go to Slateport City and listen to a whole bunch of bullcrap about Team Aqua taking the submarine then go back to the "coast in the cove" near Lilycove city and defeat Team Aqua. Then you may pass past the Wailmer to go to Mossdeep City.