You cant.
No there is no way to get to Sinnoh.
You dont
You can't go to Sinnoh in the Gen V games.
You can't. After beating N at his castle and obtaining the National Dex, you can catch Pokemon from Sinnoh.
you can't
Pokemon that are from the sinnoh, hoenn, kanto, johto
You cant find it in Pokemon White. You can only find it in Kanto and Sinnoh.
back to sinnoh
Sinnoh.
No you cannot. Chimchar is from the Sinnoh region. In White, you can only capture Pokemon that live in the Uvoua region.
Poffins are not in Black and White. You can only make them in the Sinnoh games.
Yes if you are looking at the cave of being it will take you all the way to the Sinnoh Region