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I went to http://www.gamespot.com/ and found a list of RPG games for the DS. Here's some..

Pokemon Diamond

Dragon Quest Monsters: Joker

Final Fantasy XII: Revenant Wings

Pokemon Pearl

Orcs & Elves

Final Fantasy III

Naruto: Path of the Ninja

Pokemon Mystery Dungeon: Blue Rescue Team

Rune Factory: A Fantasy Harvest Moon

Digimon World: Dawn

Digimon World: Dusk

Mario and Luigi & Partners in Time

Etrian Odyssey

Mega Man Star Force: Dragon

Spectrobes

Pokemon Ranger

Kingdom Hearts 358/2 Days

Final Fantasy IV

Final Fantasy Crystal Chronicles: Ring of Fates

Digimon World DS

Mega Man Star Force: Leo

LostMagic

Final Fantasy Fables: Chocobo Tales

Maple Story DS

Mega Man Battle Network 5: Double Team

Magical Starsign

Naruto RPG 2: Chidori vs. Rasengan

Children of Mana

Dragon Quest IX: Guard of the Starry Night (working title)

Mega Man Star Force: Pegasus

Fullmetal Alchemist: Dual Sympathy

Lunar: Dragon Song

Izuna: Legend of the Unemployed Ninja

It's a Wonderful World

Sonic RPG (working title)

Contact

Inuyasha: Secret of the Divine Jewel

Dragon Quest IV

Xenosaga I & II

Ash: Archaic Sealed Heat

Freshly Picked: Tingle's Rosy Rupeeland

Ragnarok Online DS

Justice League Heroes

Tales of the Tempest

Rune Factory 2

Tao's Adventure: Curse of the Demon Seal

Spectrobes II

Fossil League: Dino Tournament Championship

Blue Dragon

Luminous Arc 2: Will

Mysterious Dungeon: Shiren the Wanderer

Tamagotchi Connection: Corner Shop 3

Monster Rancher DS (working title)

Digimon Championship

Dungeon Explorer: Warrior of the Arts

Bomberman Story DS

Dragon Quest VI

Deltora Quest

Zoids Battle Colosseum

Vandal Hearts (working title)

Iron Feather

Western Lords

The Dream of Neko

Away: Shuffle Dungeon

Ok, some of these games aren't out yet and some might not even be released in America or if you live somewhere else, then maybe not there.

you might enjoy Final Fantasy III, IV, or Tactics A2 and Chrono Trigger but personally my favorite rpg on the DS is a game called Etrian Odyssey(But I cannot really recommend it, it can be brutally hard to someone who's never played old school dungeon hacks before) If your looking for a nice Action RPG, then check out the Castlevania series on the ds (I.E. Dawn of Sorrow, Portrait of Ruin, and Order of Ecclecia.

i suggest luminous ark it got a rating of 8 out of 10 it has a great story line and awsome characters and the graphics are ok personly i think it is the best rpg for the ds ever

new super mario