You can choose either of them, since he will give you both no matter which one you pick.
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
you are supposed to catch Pokemon and become a Pokemon master
For this you need 1 Pokemon that knows thief, 1 random Pokemon to hold a master ball, and a ditto. have ditto and the Pokemon holding the master ball go into a double battle. make ditto change into the Pokemon with the master ball. now switch that Pokemon with the Pokemon that knows thief. have that Pokemon use thief on ditto and win the battle and viola! you now have 2 master balls!
In Master Quest, Ash catches Phanpy Pokemon. This Pokemon has similar looks as an elephant, but small and blue.
giratina
in solcecon town when you keep showing him the Pokemon he wants he give you some master balls
Ultra Ball
you have to save the president of silph co. to get the master ball.
After you defeat Giovanni in Sliph Co. the President will give you the MASTER BALL.
You should get the Master Ball by talking to the President of the Silph Co. in Safron City after you saved him by defeating Giovanni.
No,not unless you use Action Replay or some other cheating device. You can,however, receive a master ball if someone gives you a Pokemon holding one.
On a certain Pokemon that you want to catch and it's hard to catch it with just a Poke Ball, a Great Ball, or an Ultra Ball. I don't know where else you can get Master Balls besides the Silph Co. I usually use the Masterball on legendery Pokemon.
You can get a Master Ball at Silph Co. from the Silph Co. President after you beat Giovanni.
The president of silph co gives it to you after beating team rocket.
The president of the sylph co. gives you lapras and the master ball
You can only receive one master ball in leafgreen version its obtained from the president of Silph co after defeating team rocket and there boss.
you cant really change balls that's not how it works you have to get the master ball from the president of the company that makes Pokemon products in saffron city. that's how you get the master ball.