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Well, I heard that there is this guy in one of the cities that gives you a poke ball everyday. The more pokemon with different ID #'s are in your party, the more chance there is of getting a master ball. If all, about 25%. If all the same, like 0% or 1%.

Nope

if you have pkmn emerald, you can do that masterball/cloning cheat, then import them over.

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