You can't without using cheats.
more like 493 master balls. its a cheat on the AR look up the code for it. its called Pokemon modifier.
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In Pokemon Diamond, Pearl and Platinum you can get one master ball from Master Cyrus. To get more, you have to cheat using a Action Replay DS or DSI, or you can trade Pokemon with your friends and receive master balls from the Pokemon that they traded.
Have your friends trade you the master balls they got.
well the max of master balls you can get is 999 but you can only get more master balls in trades.
No
game shark or action replay
buy them at walmart
give one to a Pokemon and trade the Pokemon with the master ball.
You trade Pokemon from friends that's Pokemon is holding a master ball
you have to go to the odd cheatue and then go upstairs and go to the room with a TV inside it and you do something and you'll get in a Battle, catch him with master balls or drain his hp and get him with 99 balls or more.
Pokemon lotery and action replay