you cant
1 Masterball, unless you recieve a traded pokemon which is holding a Masterball
From the Lottories.
you use a masterball
There is only one masterball in yellow.
nope [Edit] You get a masterball from Professor Juniper after you finish all 8 Gyms.
You can only get another masterball if a friend trades you a Pokemon holding the masterball they obtained.
You can't. You only get one without trading it from another Pokemon game.
The professor gives it to you at a certain point
You can't. Unless your using Pokemon emerald. don't use the masterball on rayquaza. when you beat the Pokemon league clone a Pokemon holding the masterball. Wow i never even thought of that! thanks!
In Pokemon lottery corner in every Pokemon game if ALL the digits of the lottery matches exactly in one of your Pokemon then you will get a masterball for a prize(it is very difficult though).
Have it traded from another game.. that's about it
The only way you can get more than one masterball on Pokemon ruby/saphirre is you compeate in the Pokemon lottery corner. In Pokemon emerald you can have a Pokemon hold a masterball and then clone it.After you beat Team Rocket in the Silph Co. building, then the president at the top floor, after you beat Giovanni, will give the Masterball to you.