Where can I find a master ball?

Question

I need a master ball, I had one from Cysus BUT my not so smart friend used it on a Lv32 Bronzor.

Answer 1

There are only 2 places where you can get a Master Ball in Platium.
>Galactic Veilstone Building: Defeat Cyrus

Ok, so you already got this one.
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>Jubilife City: Match all 5 numbers in the Pokémon Lottery Corner

This one is harder, and it depends on luck. But be patient, and one day you might match all of them!
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Source

Hope This Helped :D