yes
As far as I know, the Sinnoh region is not included in Soul Silver.
you cant
No it's the Johto region
You can't go to the sinnoh region.
Yes there is.
Just like the regular Pokemon In Kanto.
You have two beat the Pokemon league.
they are spread through out the region
just fly back
NO only kanto and johto
Urm... the region where you start
You can not. It is impossible for Heartgold and Soulsilver.