Wow, I'm happy to come home to this news. If I recall correctly, pokemon were the first games that made me get a DS (lite), and I'm glad I can play them on my DSi/DS lite without having to buy a new system. 
I just did a quick google search, and it sounds like DS games can still be played on the 3DS system as well, so that's good. I think I personally prefer 2D graphics over 3D models and effects for handheld games.

I just did a quick google search, and it sounds like DS games can still be played on the 3DS system as well, so that's good. I think I personally prefer 2D graphics over 3D models and effects for handheld games.