Go to the Team Galactic Building and make your way through the Warp Panels. When you finally find Cyrus, defeat him and he will give you a master ball.
There is only one Master ball in Pokemon diamond so use it wisely. I hope you can find it!
you get the master ball after beating cirus and others
you have to get master balls from professor roan
the team galactic boss gives it to you at the team galactic hideout!
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
u cant
to get master balls..you must have a friend with action replay and trade you pokemons that will hold a master ball
Get the Pokemon modifier code from codejunkies.com. then go on Pokemon diamond and go to bag while holding L+R. In your item slot you will find 493 master balls. REMEMBER THIS NAME!! ULTIMATEGHOST44!!
you can only get 1 master ball per game
You can only get lots of master balls by using a cheat/code. There is only one or two in the actual game