Pokemon games for ds?

Black and White are essentially the same. The only difference will be the legendary at the end. The legendary you get is usually the one on the cover. If you want the black legendary, I would assume to purchase white version. And vice versa. Heart Gold and Soul Silver were amazing games. I most definitely suggest getting either one. As far as diamond, pearl and platinum? They were a lot of fun, but I enjoyed HG and SS much more.