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Go on with the story line.Eventualy you will get up to the part were your in the team galactic veilstone building, and after you face Cyrus in the building he will give you one master ball.If you are talking about more than that one the only other way is to have a Pokemon from another game hold one and trade it to yours (could be wrong),or you need an action replay.

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16y ago

What else can I help you with?