You don't have to beat them.Just go to Slateport city and talk to Stern in the slateport harbor.There you will find the aqua leader and then when you return to their base ,the two guards are gone and you'll have to beat them inside the cave.this i think is the answer.
there on the mount after the lady that sells lava cookies if you have the badge it will open automaticaly
The entrance of what?
Go to Slateport City, go to the boat port and after the cutscene, the hideout will be accessible.
I found it by the entrance gate to fort charles with the navy guys guarding it.
beat the bad guys
beat the elite four and have 60 pokemon, talk to professor oak, go to one island, talk to Celio, and go to the two team rocket guys talking about treasure, fight them and go through the cave they were guarding, talk to celio again
Beat all big bad guys that take more than one second to beat and when you see warp go through it .If you have beat all big bad guys than go through a red warp then beat the boss.
We light candles and dim our dimming lamps.
Booms
why do fish swim
for the battle tower u beat the guys 21 time for all the places and for the battle hall u have to beat 51 guys or girls
go to team magma's base after you get the magma emblem magma's base is at the route next to fiery path then beat team magma in there then go to team aqua hideout then when you talk to the team aqua members they will say that their boss is at slateport city at the ferry harbor when you go there team aquas boss will steal their submarine then when you go to team aquas hideout the guys won't be blocking anymore