Well let's see:

There's the obvious Pokemon... not great RPGs unless you really like the grinding/development aspect, but hey the monsters are cute

Etrian Odyssey is a decent Wizardry clone.

Mystery Dungeon games! Shiren the Wanderer, Izuna, Pokemon Mystery Dungeon. That actually reminds me, I wanted to play Izuna again...

Mario & Luigi Partners in Time good good reviews, but I haven't played it yet.

Dragon Quest IV should be out by now, idk I haven't looked at DS games in a while. I heard they were remaking V and VI too.

Lunar Knights was a decent action RPG, though the RPG-ish elements were a little subdued. It's more an action-adventure game.