Yes, it will play in any DS or DS lite. There is no region coding on this game. It's been played once.
Please give this game a good home!
I also have the first volume of Princess Resurrection (Kaibutsu Oujo), asking 6$ (including shipping) for that, and a Pheonix Wright/Gyakuten Saiban gag doujinshi (asking 10$, not including shipping) as well. Give these items a good home, since I hate to part with them!!