For anybody who didnt know, you get the master ball from eagun. After u beat EIN in Realgam Tower, u get an email from eagun. go visit him for your master ball.

OK this cheat is super easy.
1. Have your first pokemon use a Master ball on a shadow pokemon.

2. Have your second pokemon go to items, and swap the master ball with a different pokeball, like a net ball or ultra ball.

3. After you catch the shadow pokemon, check your items. you still have the master ball. after you get it, catching the shadow pokemon is so easy, it is kinda sad.

This cheat works on all types of PokeBalls.

Now i have just one word for you. ENJOY!!!