you cant there is only one
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You need action replay. You buy it at a store then hook it up to your DS or DSI the, you type in codes that you get from Youtube. GOOD LUCK :-)
Well if you go inside some poke'marts you can buy them from there. Hope this helped!!
You can buy them, at the Pokemon leuge thjey have evry kind of ball except master and cherish balls
Buy a Action replay and stuff
in the pokemon league after beating the elite 4 talk to each 5 times them YOU HAVE TO BEAT THE CHAMPION WITHOUT LOOSING 1 POKEMON AND THEN GO TO THE BLACK CITY mart and you can buy master balls