How do you get the team aqua leder bake to the team aqua hideout?

you battle them

you go around the maze of a hideout until you see four pokeballs i think the top left is the master ball

Find the regi's beat the elite 4, the battle tower.

You sneak in stupid

Yo so you go in battle around the first guy take the stairs there are then two battles go down to the teleports on the bottom left first and find ur way through those to get a nugget and a masterball...