Well once you beat the game you can give master ball to one of Pokemon that you trade then you will have 2. Or you could copy your Pokemon in emerald when there holding masterballs then give the master balls to your real Pokemon and trade them over!!
You cannot find a second master ball however you can trade Pokemon to get another Pokemon with a master ball or use an action replay
there is no master ball in diamond and also great ball. but there is silver ball-silver ball is like a master ball.
Have a friend trade you a Pokemon holding the master ball they got.
if you beat the boss of team galactic, you will get a master ball from him
A Poké Ball can't be changed into a Master Ball.
The only way to get another master ball in Pokemon dimond whithout cheating is by giving a Pokemon a master ball as an item in another game and trading that Pokemon to your Pokemon dimond game and take the master ball then you can use it. Or you can get an action replay at www.amizon.com for $20.00 and find the master ball cheat for it then you can get lots of master balls all the time it realy works try it.
you get a master ball from proffeser rowen to catch Dialga
In each game, there is only one master ball obtainable. However, you can get more master balls with an Action Replay device, or by hacking the game, or by trading over a Pokemon holding a master ball from another game.
giratina
how to catch dailga in Pokemon diamond use the master ball
u can only get another one by trading wiv a friend.
get an action replay