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.
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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
you can't that I'm aware of, ya moron and two POKEMON IS SO RETARTED! your mom
It depends what game you're playing, but in the 3rd and 4th generation I know you can win a Master Ball from the Lottery Drawings, and in the 5th generation by trading with 50 different people and talking to someone in a Pokemon Center.
at cinnabar island there is a net ball 5 master balls in the hidden chamber (you need hidden power) and last but not least 5 timer balls!not sure but I think after you beat the league Kirt will use two different apricorns
its more pokemon black two then it i black one