you can't buy master balls but, you can get them from winning the lottery and Jublife city or, Cyrus will give you one.
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no unless you buy action replay witch is not that hard to buy just go to wall-mart and buy one ($20.00) most likely
you cant there is only one
You can buy them, at the Pokemon leuge thjey have evry kind of ball except master and cherish balls
Buy a Action replay and stuff
in the pokemon league after beating the elite 4 talk to each 5 times them YOU HAVE TO BEAT THE CHAMPION WITHOUT LOOSING 1 POKEMON AND THEN GO TO THE BLACK CITY mart and you can buy master balls
You can buy the dusk balls in Pokémon Diamond at various markets in the game. The dusk balls cost 1000.00 a piece.