any good ds rpgs?

i was thinking that i need a good enjoyable rpg game because im bored of most of the games i have and the reason for that is that because the games i am getting are free unless i really like them i wont play them so any suggestions of really good or mildly good games.
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or any strategys good ones

Everyone has different opinions, but my personal Fave DS RPG's is....
- Super Robot Taisen OG Saga : Endless Frontier
- Kingdom Hearts 358/2 Days
- The World Ends With You
- Suikoden Tierkreis
- Megaman Star Force series

hm...
FF 4
FF tactics A2
kingdom hearts 358-2 days
phantasy star Zeroluminous arc (any kind of it, it's good for tactics)

FF3
Sands of Destruction (some dislike it :/)
Chrono Trigger
Fire Emblem (all)
Mario and Luigi (both RPG ones)
Pokemon? classified as RPG or adventure? :s
SMT Devils Survivor sort of an rpg

Chrono Trigger
Dragon Quest IV and Dragon Quest V Remakes (VI will come soon)
Dragon Quest IX (coming to North America soon as well)
Fire Emblem
Phantasy Star Zero