After beating the Elite Four, return to New Bark Town and talk to Prof. Elm. He will give you a Master Ball.
*Remember this is the only Master Ball you will get in the whole game!*
ho oh
it is something stupide
no
use a master ball
probaby kyogre
After you defeat the main 8 gyms professor oak will call you to his lab and say he has something for you. Then he will give you a master ball.
To get an additional master ball, you must either trade it from another Pokemon game, or use cheats to get one.
You get a master ball after defeating the eighth gym. You'll receive it from prof. Elm.
profecer elm givs it 2 u
in the light house.you get it once you beat the rcoket grunt.
you don't.
The trick is to save your master ball.