there are no other regions in Pokemon black or white.
No, you cannot go to other regions in PokÃ©mon White.
You can't go to any other regions except Sinnoh.
of course not . Unova region is not connected with any other regions
No, there are no other regions in Pokemon Diamond.
Yes you can but only after you beat the main game and obtain the National Dex
It is the same as any other games, but you can't trade with other pokemon games. You can only trade your pokemon from the different generation games, you can't give your white version pokemon to the earlier generations.
Pokemon Black and White are not compatible for trading with any of the other previous games.
Pokemon Black and White take place in the new region of Unova. Just as the old regions like Kanto and Sinnoh are based on Japanese prefectures, Unova is based on New York City. You cannot visit any other regions in Black/White.
No. However, ruby is the gemstone version of red corundum. Any other color of corundum is considered a sapphire and it does come in white. So you are really describing white sapphire.
You cannot go to any other regions in Pokémon Black.
The Pokemon Victini, does not exist in any version made before Pokemon Black and White. Since it was released to catch in 2010(Japan) and 2011 (other places) it won't be able to caught in any other version before Black and White. Unless they made another event where you can catch Victini in other versions you could not catch it.