you can't
My geuss is the ds game shark.
unfortunately you can't get 99 or even just 2 master balls but you can get 1st at silph co in saphron city.
8202583c 0001 8202583e 0063
you have to get a game shark for your game and insert the game pack inot the shark them select unlimited master balls and you will get them but it wont be unlimited anyway
there is a game shark cheat THAT WORKS for Pokemon ruby there is no codes. it's for having all the poke balls,so then you will have 99 master balls and then give one to a Pokemon and trade it. once you have traded it, take the master ball from it and repeat this process.
you can only get 1 master ball per game
That depends on the Pokemon game.
Not that I am aware of! You can however use cheats to give you up to 99 master balls!
You can't unless you trade them 99 times over, or if you hack the game.
action replay
First, you must enter the master code: 00000554000A 101DC9B00007 830050000000 830050020000 Then, simply enter the codes below and 99 of every kind of ball (including Master and Safari balls!) will be in your bag. 420259D80001 0001000C0004 420259DA5212 0000000C0004 Remember, this is for Gameshark GBA and not AR, so I hope this is the answer you were looking for. when i entered the code, i got 99 of all the catch balls, and then my game just went to the open file screen and every time i pressed A it would start the begining video of the star going across the screen, so it was a never ending cycle...
You can NOT get 99 Master Balls unless you have a gameshark.