You don't, as there's only one Master Ball in the game. You can hack to get more, but otherwise, there's no way to do so normally.
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One masterball is in Pokemon emerald. To find out more go to my site called www.miquel.ning.com
if u use any masterball cheat u get bad egg in Pokemon PC
you get it when you beat all the johto badges in the game and prof. oak will call you and give you a masterball p.s never let a sister use your pokemon games if she doesn't know pokemon and you have a masterball hope this helps!
You have to defeat Cyrus once more, at the Veilstone Galactic HQ. Hope I helped!
no there are not sorry.