How do you obtain another Master Ball after you have used the first one? In: Pokemon HeartGold and SoulSilver
i want to catch another legendary pokemon but I'm all out of master balls's :(
To obtain another Master Ball after having already used the first one, you must have some luck on your side. The Goldenrod Radio Tower has a Lottery Corner, where if all 5 numbers of the ID of any of your Pokemon match (including those in the PC), you will receive a Master Ball. You can do this multiple times, but takes a lot of luck and patience.
You can also have a friend trade over a Pokemon with it holding a Master Ball.
If you have an Action Replay, you could use a code to get another Master Ball.
You go to Prof. Elm when you beat all the gem leaders. He will give you a master ball, so when he gives you the master ball you hold down x and tap the screen and you have 2 master balls