Sinnoh.
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No.
Yes, you can play Pokemon Black and White on a PS3. Go get it now and play it on your PS3.
Go to White Forest when Ken is the resident, if he is, use Entralink to go to Black City from Pokemon Black and you'll receive Nidoran.
You cannot go to the Sinnoh region in Pokemon Black.
It is in White Forest when Herman is the resident, if not, use the Entralink to Pokemon Black version and go to Black City to get to that resident.