I just got my hands on a (very hard to find!) copy of Monster Rancher DS. I've always been a fan of the series, what little of played of it since I only got started with my Monster Ranch-ing on the Gameboy Advance (not having a PlayStation until I got my 60GB PS3 just two years ago will do that to you), and well, there's something just so damn charming about the series. Being able to spawn these, uh, Spawn using unconventional means, then raising them as you go gallivanting through various tournaments and distant lands.  There are some elements I know will not appeal to a lot of people, but I can tell you that there are more potential fans of the series then the dead boards here seem to let on. 

It's a deceptively simple game and worth checking out if you're curious or a fan.