In Pokemon black you can get only one master ball, heading to route 10 having all the badges Professor Juniper will stop you and she will give you one.
You can get 2 Master Balls in both versions.
You don't.
you trade 100 times
you can't
hack the game
In skyrim
Ar code
you can trade a Pokemon from black or white holding a master ball.
action replay codes
the professor will give it to you after you have beaten the 8th gym.
u can only get one master ball in Pokemon Black to my knowledge, unless u trade with someone whose Pokemon is holding a master ball, or if u hack it, which there is no hack to.
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