To do this you need to have action replay. Cheat codes are all over websites.
2
you can not get a master ball in Pokemon platinum only the one professor Rowan gives you
You can't.
cheats
There is no place you can buy Rare Candies or Master Balls in Pokemon games. You can get Rare Candies from the Battle shop in the Battle Frontier in Emerald and later games. You can get win Master Balls in lotteries in the games.
Action replay
no
cyrus gives it to you
Buy a Action replay and stuff
Yes there is a code for 999 master balls in Pokemon platinum
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
Pokemon lotery and action replay