3DS is backward compatible with DS.....Pokemon Black/White was the best Pokemon since Gold (but X & Y might be better). Still, now that you can, you may as well pick that up too. Also Black 2 has a different over-map, so it's like another Pokemon, and then there is Diamond/Pearl/Emerald, which is another Pokemon......
....Oh and don't forget the Pokemon HeartGold Remake, it's awesome!
Now if you also like Pokemon, and haven't owned a Nintendo console since GBC....let me fill you on on what you've been missing. Fire Emblem & Advance Wars. Just awesome games, get them, especially Fire Emblem Awakening for 3DS.
A few other DS recommendations, Infinite Space, Radiant Historia, Suikoden, Dragon Quest Remakes & IX, Final Fantasy Tactics A2 & Front Mission DS.
That should get you started.
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Honestly, now that you're planing on buying a 3DS, get f***ing Fire Emblem Awakening. I'm watching you.
What is with all the hate? Don't read GamrReview Articles. Contact me to ADD games to the Database 
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