DS Daily: There can be only one

All this week, the DS Fanboy staff is going to take time out to let you guys in on some of our favorite games, so it's only fair that you return the favor. But since we're, y'know, evil, we're going to make it hard for you. Due to some incredibly horrific string of events, you must choose one DS game (and only one), and that is the only DS game you'll have. Forever. Yeah, we know, it's rough ... but sometimes, that's just how things go.

So what do you pick? Which one game stands above all the others?