To make any normal Pokeball (not Great or Ultra Ball, just your normal, average, everday Pokeball) a Master Ball, do this: when you throw the ball, hold down A and B, but from the time that the Pokemon goes into the ball to the time that it hits the ground, hold B and Select. Works nearly all the time if you have perfect timing. I caught kyoger and rayquaza with it!
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A masterball would be the best choice but if you want to save it, you should use a Pokemon that does not let him flee (he always flees after the first turn) and use regular pokeballs or ultra balls
Simply put, you cannot. The "Select-A-B" combination among other things are just superstition and do not really work.
First, give a masterball to a Pokemon (suggestion: legendary,) then put it in an empty box. When it is finished doing the "Saving... do not turn off the power" thing without u pressing A, shut it off. when u turn it back on, it should have your Pokemon in your party, and your masterball in your bag. the Pokemon u copied will also be in your PC and it will be with the masterball!!! this cheat also works on other versions
where you use the key to turn on the quary.
Always turn right