When going through the Team Aqua hideout, there's a spot by the grunt that looks around in the center of the desks. Battle/avoid her, then head to the right to the teleporters. One leads to a room full of said portals, needed to get to the Aqua Admin, the other takes you to a room with four balls in it. The two in the front are Electrodes, so don't press "A" on those. You want to go to the ones behind it, one I believe is a nugget, the other is the Master Ball!
From the store
action replay
no
you can use a game shark to get unlimited master balls
Master Code: D8BAE4D9 4864DCE5 Buy Master Balls Code: 82005274 0001
No. However, you can clone a Master Ball on Emerald. There are also codes to get multiple Master Balls.
one
1
You don't.
you have to clone that Pokemon holding a master ball
There is only ONE I believe.
kaleb's cheating device.