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Professor Elm gives you a Master ball after you defeat the Blackthorn City Gym.

Alternatively, you could give the Master Ball to a Pokemon to hold on a game that has already received the ball, then trade said Pokemon, with Master Ball, to the newer game.

Winning extra Master balls is possible by matching all five numbers with the ID Lottery at the Radio Tower in Goldenrod City. The chances of winning them this way is very slim, however.

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13y ago

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