What DS RPG should I buy?

I definatly reccommend Pokemon HeartGold, Pokemon SoulSilver, Pokemon Black, and Pokemon White. But if you have a flashcard like an R4 or an Acekard (one of those DS cards you can play downloaded games on), then I reccomend you get Tales of Innocence, it's a japanese game, if you buy it off Ebay you won't understand anything, if you have a flashcard then you can download a patch to translate the japanese into english.