I'd like to play the Japan-only TCG2 game (with a translation patch, since I don't know any Japanese). There are a couple other Japan-only releases that I'd like to try, for comparison's sake, as I've only played the American versions. I'm also curious about the WiiWare PMD game that came out as three versions in Japan a few years ago. (And of course, since the new PMD is out in Japan, I'd like to play that, but I plan on waiting for an English language version in November.)
I've played most of the Pokemon games, so there aren't many that I'm dying to try. I guess I could try Conquest or the Ranger series, but those have never held much appeal for me, for whatever reason. Other than that, I've never played PMD: Explorers of Sky (though I played Time and Darkness), so I wouldn't mind going through the extra content in Sky at some point.