Prof. Elm will give you one at some point in the game
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You get the Master Ball in the Aqua base off of Lilycove. It is in an area with two Electrodes and one Gold Nugget.
Kurt can not mak a master ball unless you hav an action replay code to make him make master balls
you need an action replay.
No cloning is not possible in HG/SS
There are no Master Balls on the SS Aqua in trash cans in Pokemon Gold. A Master Ball is a rare Pokeball obtained from an in-game event.