you can get one from trading from someone else a pokemon that is HOLDING a master ball, or you can use cheats
the master ball is for zekrom in white and reshiram in black
you can trade a Pokemon from black or white holding a master ball.
yes only one
In white you use the master ball in black you trade
professor juniper gives it to you
From the professer in main story at plane town
Yes, you can get a master ball in Pokemon black. You get the master ball towards your last gym battle from Prof. Juniper =)
The best pokeball to catch victini in white/black is the ultra ball or the great ball you shouldn't use the master ball.
A Master Ball NEVER fails in the newer games because the way pokeballs work was updated, however in the older gba games there is a small chance that a Master Ball will fail.
Surprisingly, yes. In Black and White, if you trade with people from fifty different countries, you receive a second Master Ball.
Definitely Thundurus. You can get 2 Master Balls in Black and White. You should save the second one for shinies or event pokemon.
Either catch it with the Master Ball you received in Pokémon White or trade it with someone over the GTS.