You can't get more MasterBalls. You can only get one, unless you get very lucky playing the lottery ticket game in JubilifeCity.
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There is only one master ball in Pokemon diamond. But there is a cheat for getting a WHOLE lot more. Look it up at how do you get 98 master balls? I don't know where the master ball is I think it's in a team galatic headquarters.
In each game, there is only one master ball obtainable. However, you can get more master balls with an Action Replay device, or by hacking the game, or by trading over a Pokemon holding a master ball from another game.
more like 493 master balls. its a cheat on the AR look up the code for it. its called Pokemon modifier.
more like 493 master balls. its a cheat on the AR look up the code for it. its called Pokemon modifier. you can keep refilling it though.
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