Question

Do you receive Master Ball before challenging Reshiram/Zekrom?

Comments

It is easier to catch them than it was any other legendary. Save the Master Ball for Kyremu.

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I used Master Ball only once, on Regigigas...I couldn't resist thatX))

Answer 1

In every pokemon game you always get a masterball before you battle the games main pokemon

Comments

But only fools use them right away ;)

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Or lazy people use them right away like me

Answer 2

You can get Two Master Balls In Generation V.

1. You get one from Professor Juniper in Opelucid City after getting all 8 Badges.
2. From the man in the Castelia City Pokemmon Center after trading with 40 peoples, GTS or locally. He is standing in the back in a suit and shades.

Comments

It is after trading with 50 people, not 40.