yes you give it to a Pokemon as a hold item and do the cloning cheat
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you will only be given one master ball.
YOU CANNOT MAKE A POKEBALL WORK LIKE A MASTER BALL!Unless you use a cheat code.As far as I know,you can use a Timer Ball to act like a master ball.Wait for at lease 55 turns or more for the Timer ball to work.
by completing all the gym battles in johto( then finding the dragon fang) and you will get a phone call from prof elm,fly to his lab,then he will give you a master ball,to get more balls equip a Pokemon with a master ball and duplicate that Pokemon
You can't get another master ball in emerald because there's no one will give you the master ball just the general will give you that.
You can't always get master balls in any version of Pokemon, or so I've heard. You usually get a master ball once, unless you either clone it or look for it all around the Pokemon world. My advice to whoever wrote this question, don't use the master ball until the time is just right! Okayy... now look over here and not at that useless JUNK! To get masterballs in sapphire and ruby is the " Lucky Number thing " also in silver gold and crystal version you can clone the Pokemon. To clone them look at like " How to clone Pokemon in silver version " or something... anyway and in the Diamond and pearl you can clone too. idk how to obtain masterballs in red blue green and yellow version and idk about platinum too. but this... is all i no.