How to get more than 1 Master Ball in Pokemon Pearl?

I know you get 1 from Cyrus, but how do you get more? or:I know you get 1 from Cyrus, but how do you get more?or:You can't get more masterballs

I know you get 1 from Cyrus, but how do you get more?

or:I know you get 1 from Cyrus, but how do you get more?

or:You can't get more masterballs

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