How do you use the 999 master ball cheat code in Pokemon Pearl?

No that doesn't work because codejunkies just has the downloading stuff -Jessi Circle she's rite but to activate it put an item put a type of pokeball you don't use in the first slot of the ball items, then exit out of the bag then push l+r at the same time and you should have 999 masterballs. hope that helps hackmastr123456