No, only jhoto and kanto
You have to have arceus to get to sinnoh but only once
you cant
You can't go to the sinnoh region.
As far as I know, the Sinnoh region is not included in Soul Silver.
No
There is no sinnoh region in heartgold or soulsilver, it is only Johto and Kanto.
In the Sinjoh ruins of alph?
you can't you have to trade
You can't.
The Sinnoh Sound radio station will be playing on Thursdays.
You can not. It is impossible for Heartgold and Soulsilver.
yes but only by trade