you need an action replay.
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there is no master ball in diamond and also great ball. but there is silver ball-silver ball is like a master ball.
u can't
well there are couple of ways to do it 1.action replay 2.have a ditto and another Pokemon holding a master ball and there will be a 50% it will hold one p.s if u want to do number 2 u have to have a master ball
You can get 3 master balls in soul silver and heart gold with using the 999 master ball cheat. I DO NOT know the cheat code.
That is impossible.