In need of DS games with deep customization

Title can really say what I want to say.
DS games that is driven by customization is what I need. Like those in the lines of Armored Core, Gran Turismo, Monster Rancher, Yu-Gi-Oh!, etc....As references, and also as an informative list on what I've played already:
Yu-Gi-Oh! Card Battle Games
Final Fantasy Tactics A2 - Grimoire of The Rift
Animal Crossing - Wild World
And some others that I can't remember.

Custom Robo Arena maybe?

WWE smackdown vs raw 2010 has a pretty deep create a wrestler mode.

Dragon Quest 9 looks as though it has a deep customization system, but that isn't out yet.