In Pokemon Emerald you can give one of your Pokemon a master ball and clone it. To clone, read this website : http://www.wikihow.com/Clone-Pokemon-in-Emerald
You can clone up to 5 Pokemon.
Note that this method of cloning is not 100% safe and your game may get corrupted.
You use the cheat.
You can buy Game boy Advanced cheat games. You can then Click on the 999 Master balls cheat.
You can only get lots of master balls by using a cheat/code. There is only one or two in the actual game
Master balls are the best kind of Pokeballs you can get on the game Pokemon. The cheat for unlimited master balls is to use the Missing No glitch.
if you have got a r4 you go on cheat. if you have a action replay you use it and put it in the take it out and then you put Pokemon pearl in and the pick the cheat
You can get 3 master balls in soul silver and heart gold with using the 999 master ball cheat. I DO NOT know the cheat code.
There are none.
yes the cheat counts for all poke'balls
There is no unlimited Master Balls cheat, but maybe you're talking about using an ActionReplay/GameShark. I wouldn't know about those. There is a way to duplicate Master Balls though, but that is only available in Emerald Version.
more like 493 master balls. its a cheat on the AR look it up.
CHEAT
cheat code to get infinite master balls fire red gameboy advance