You can't the only way to get a master ball is with a cheat cood or go to the other dementon and battle Cyrus and beat him then he will give you one master ball!
You can get 2 Master Balls in both versions.
well the max of master balls you can get is 999 but you can only get more master balls in trades.
You Can't
use a game shark and type "22671 master balls 99857=999
cheats
after you beat Cyrus in veil stone city
You cannot duplicate Master Balls in any Pokemon game.
From what I know, You can't BUY master balls in Pokemon.
First of all it is Pokemon Platinum NOT Pokemon platnum. The best way I would is by using a master ball. but you can keep holding it off and about an hour later use a timer ball.
Get rid of some of the master balls! the number of master balls you have is the number of the pokemon
Getting master balls without cheating in Pokemon DP is very hard. The only ways are: to win the lottery in Jubilife City, or receive a Pokemon that has a master ball from trading. I have 2 master balls in my game. I traded with a person who had a Pokemon with a master ball.
You can get 2 Master Balls in both versions.
you have to have Pokemon platinum and a action replay then if u want just give your Pokemon master balls and trade them to games you want to have master balls
Have your friends trade you the master balls they got.
Master balls cannot be brought, only given or won.
you have to clone that Pokemon holding a master ball
Get the master ball and cloning it