you can go to all the regions. First tou have to beat the battle frontier and find this old man with a ghost Pokemon and then you go home and you will find may.and you will get to battle any were.
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Go to other regions and talk to the professors sorry that's all i know
you can go to all the regions but the bad side is you must beat your rival 2000-2700 to get all of the regionshope this helped!!!
At least 20( a lot)
go to codejunkies.com and look up Pokemon platinum if its not there then go to supercheats.com search for Pokemon platinum and click on the ar codes button
No.