There is no sinnoh region in heartgold or soulsilver, it is only Johto and Kanto.
You can't go to the sinnoh region.
As far as I know, the Sinnoh region is not included in Soul Silver.
you can't you have to trade
You can not. It is impossible for Heartgold and Soulsilver.
In one of the caves in the lakes in the Sinnoh region.
you have lear to back flip
You have to have arceus to get to sinnoh but only once
you cant
unfortunately no, they are only available in the Sinnoh region. you can give them massages and haircuts though.
Because Platinum the region is Sinnoh, you can't get Charmander. On Heart Gold and Soul Silver, you can go to Johto and Kanto. But no Sinnoh for Platinum.
You cannot catch a Buizel in HG/SS because it is only found in the Sinnoh region.
No