Below is a recommendation list for good turn based rpgs on the Nintendo DS. With the amount of ports and remasters on Nintendo DS the first list is new games and the second list of ports/remasters/remakes.

• Dragon Quest IX: Sentinels of the Starry Skies
• Mario and Luigi: Bowser’s Inside Story
• Pokemon Black/White
• Pokemon Black Version 2 / White Version 2
• Pokemon Conquest
• Pokemon Diamond/Pearl/Platinum
• Radiant Historia

Here is the list of ports/remasters/remakes of good turn based rpgs on Nintendo DS

• Chrono Trigger
• Dragon Quest IV: Chapters of the Chosen
• Dragon Quest V: Hand of the Heavenly Bride
• Dragon Quest VI: Realms of Revelation
• Final Fantasy III
• Final Fantasy IV
• Pokemon HeartGold / SoulSilver

This concluded the recommendation list of good turn based rpgs on Nintendo DS. If you want to see other systems feel free to check out my recommendation lists of other Good Turn Based RPGs By System and All Time Best Turn Based RPGs