you use 1 master ball if you use action replay or you can let a Pokemon and trade it with the master ball.
Don't listen to the kid on the top.........you cant trade a Pokemon that's holding an item from Soul Silver or any of those games to the white or black version.
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Yes, you can get the moon ball in Pokemon Black and White, but you have to have an Action Replay Dsi to get it. It isn't like a normal pokeball, you can't catch any pokemon with it, the ball is just an item. List of non-pokeballs: Fast Ball Level Ball Lure Ball Heavy Ball Love Ball Friend Ball Moon Ball Sport Ball Park Ball These are just items, not real pokeballs, so dont expect them to catch any pokemon.
If you are in battle with another trainer you cannot catch that Pokemon that belongs to them. But if you find out where that Pokemon's habitat is (by using the pokedex) then you can go and catch it with a poke ball, great ball, ultra ball etc...
jiroxy ball...
you don't need a master ball. i caught mine without it. it is hard to catch, but the Pokemon is worth it. try putting it to sleep, or paralzing it, and putting his health into red (without killing it). Also, make sure you save before to talk to him, otherwise if you kill him by accident, he's gone. hope i helpd, :) good luck!
no