Yes, DS games are region free.
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You can play Pokemon silver version on any of the gameboys,but not on the ds.
There isn't one, the gs ball was a promotional item if you bought gold/silver in japan. If you have the Japanese version you can get it.
No No
pokemon soul silver/hart gold
No, Pokemon Chaos Black is a hacked version of Pokemon. The next official Pokemon games are Pokemon Heart Gold and Soul Silver, remakes of the 2nd generation Gold and Silver versions.