I'll probably regurgitate what's on everyone's list... aw well.

Nintendo DS
Mario & Luigi: Partners in Time
Sonic Chronicles: The Dark Brotherhood
Sonic Rush Adventure
Chrono Trigger DS
The World Ends With You
Lunar Knights
Final Fantasy Tactics A2: Grimoire of the Rift
The Legend of Zelda: Phantom Hourglass

PSP
Final Fantasy: War of the Lions
Crisis Core: Final Fantasy VII
Dissidia Final Fantasy
Wild Arms XF