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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
to get a 2nd master ball trade with 50 diffrent people and go see a man in black in the castela pokemon center
You gat a master ball after you defeat dreyden in black , or iris in white, professor juniper gives you one , then if you go to the Pokemon center in castelia city , you must talk to the man next to the union room , ( with the black hair and sunglasses) and after you have traded fifty Pokemon he will give you a master ball, he also gives you a choice scarf , a zoom lens , a wide lens , an everstone , and I can't remember what else off the top of my head , but I think those are the two ways, or you can just trade Pokemon who are holding master balls, I hop that helped
No, it is a version exclusive to Pokemon White. You'll have to trade it from someone who has that version.
One is given to you by Professor Juniper, near the end of the main plot. The other is given to you by the man who asks how many Pokemon you have traded. He gives you rewards depending on how many you have traded, the reward for trading 50 is a Master Ball. You find him in Castelia City's Pokemon center.