First U need Google Chrome.(also u need to waste al your masterballs to 0)
Then Follow the Instructions:
1.Find any wild Pokemon.
2.Battle with it.
3.now right click on the button besides pokeball
4.click Inspect Element.
5.there will be a line that highlighted in blue.find value="Pokeball" and change it into value="Master Ball".
6.then close the bar and select pokeball and use it.
Done!(now u can only use one per turn.in v 1.8.I got 2555 masterballs)
Then Follow the Instructions:
1.Find any wild Pokemon.
2.Battle with it.
3.now right click on the button besides pokeball
4.click Inspect Element.
5.there will be a line that highlighted in blue.find value="Pokeball" and change it into value="Master Ball".
6.then close the bar and select pokeball and use it.
Done!(now u can only use one per turn.in v 1.8.I got 2555 masterballs)