you get it when you beat all the johto badges in the game and prof. oak will call you and give you a masterball p.s never let a sister use your pokemon games if she doesn't know pokemon and you have a masterball hope this helps!
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you get 1 after you beat the 8th gym and go to dragons den for a test.
You probally want to use it on mewtwo because it is level 70
if u use any masterball cheat u get bad egg in Pokemon PC
no you can trade soulsilver pokemon to black
no there are not sorry.