you can ether cheat or look around everywhere
you can not get a master ball in Pokemon platinum only the one professor Rowan gives you
Yes there is one Master Ball. You can find it after you beat team galactics boss and he gives it to you. Hope I helped you out!
Defeat Cyrus at the Veilstone Galactic Building.
After defeating Cyrus in Veilstone, he should give a Master Ball to you.
a master ball
After you beat Cyrus at the Galactic HQ, he will give you one Master Ball.
You get it when you beat the Galaxy Leader in the Base in Veilstone City. He brings it to you!
with a master ball or timer ball
In Pokémon Platinum, Cyrus, the leader of Team Galactic will give you a Master Ball once he surrenders his plans in his Veilstone Headquarters.
with a master ball
Master Ball.
i used my master ball