Getting into the DS and 3DS libraries for the first time. Reccomendations?

I was going to recommend Pokemon Mystery Dungeon: Explorers of Sky until that last part. Still has a damn good story though.

There's also Pokemon Ranger: Shadows of Almia and Guardian Signs, which aren't exactly RPGs and make heavy use of the touch screen for "combat". But do NOT play the original Pokemon Ranger. That one is ass.

Kid Icaurs: Uprising is a must

There's some good Kirby Games (though I'd personally avoid Canvas Curse and Mass Attack)