You get it in The Team Aqua Hideout by Lilycove City.
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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.
For Pokemon emerald via gameshark Master code: D8BAE4D9 4864DCE5 Master ball code: 82005274 0001 The master ocde is very important. You will get master ball in any pokemart for free after you type the "Master code" and the "Master ball code". HOPE IT WORKS!
Beat Archie
No.
you can use master ball in caught the groudon