you can only get 1 master ball per game
go to oak and press L
== == you get masterballs in diamond and pearl by gotting a wifi mystery gift on Christmas, GMT use cheats
you have to get master balls from professor roan
action replay
There are none.
You can NOT get 99 Master Balls unless you have a gameshark.
you can't
with acion replay
u cant
to get master balls..you must have a friend with action replay and trade you pokemons that will hold a master ball
look in all the bin's on the first three city's and there's 99 master ball's in one I think.
My geuss is the ds game shark.