yep if u buy an action replay a code it comes with (for ds) is pokeballs act as if they were master balls. the code is only conpatible with diamond pearl; possibly platinum
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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!
It's possible, but it's harder to catch them. So I suggest using the master ball. Another thing you might ry is before using any other pokeball, weaken them to the red and put them to sleep or any other status effect. Then try throwing a pokeball other than the master ball. Hope this helps you. nvrmnd don't use the master ball if you have any try to catch it with a lvl. ball i did
When catching Celebi, you should have a cherish ball. Throw it and it will be an instant catch. (DO NOT USE A MASTER BALL OR ANY OTHER BALL.)
get an action replay
Any pokeball will work but an ultra ball is probably best.