You go to the Poke-mart and buy 10 pokeballs. You will get a preimer ball as a bonus. i hope this helped!
cheats
You can't.
you can not get a master ball in Pokemon platinum only the one professor Rowan gives you
1 master ball and a WHOLE LOTTA ultra balls AND dusk balls!
You can buy them at the Pokemon mart at the Pokemon league. I buy my timer balls, heal balls, etc. at the Pokemon mart in canalave city
Action replay
no
Get ultra balls and get your behind up in there
cyrus gives it to you
2
Hearthrome city
i think u have to import from Pokemon dp or platinum