Well first of all if you have an action replay (which you can buy online at gametraders.com.au) or if your really lucky the first prize in the lottery is the only other masterball you can obtain.
u cant
ACTION REPLAY
game shark or action replay
you have to get master balls from professor roan
There is only one master ball in Pokemon diamond. But there is a cheat for getting a WHOLE lot more. Look it up at how do you get 98 master balls? I don't know where the master ball is I think it's in a team galatic headquarters.
There are none.
You need action replay which you can find at game stop. then you scroll down and find more master balls. I don't have the code though, sorry but there is one of the wiki answers where it tells you the code. it's how do you get 98 master balls? I hope it helped!
with acion replay
to get master balls..you must have a friend with action replay and trade you pokemons that will hold a master ball
you dont......you have to cheat but i am still trying to figure out how.
you can only get 1 master ball per game
There's no such guy in Sandgem Town that has 3 Master Balls.