First of all, you can trade them from other games such as Diamond, Pearl, Platinum, Soul Silver or another Copy of Heart Gold. Also, in the Goldenrod Radio Station, the woman in the middle is the lottery lady. Talk to her to enter the daily lottery. If you are very very lucky, you will win a Masterball, but it is incredibly unlikely.
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yes u can in all pokemon games
first watch a video youtube from how to get there it will tell you then get the master ball it will work
You can't get another master ball in emerald because there's no one will give you the master ball just the general will give you that.
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.
you may trade with another person with a mater ball or you may go to the jublife lottery and if you have luck you may match up all the numbers and you will get a master ball :)