How do you get master balls on Ruby?

Answer 1

to get a master ball in Pokemon ruby get to team magma's hide out battle every body there and you will see some transporting circles try each one until you are transported to three lanes try each one again you will be at four pokeballs one will be a nugget a master ball and 2 elctrodes

Answer 2

In Team Magma's Hideout, there is a room that has 2 or 3 Electrodes and the master ball is surrounded by all of the Electrodes.