The only thing I remember of Monster Rancher is that my friend Kevin once had the original for PS1. It looked fairly decent but nothing truly mindblowing. I'll still take a look at MRDS, but it's not my most anticipated title, that goes to the new Ace Combat game on PSP this time, doesn't take a genius to figure out why, anyone who can see my sig should get some idea. Or possibly Kingdom Hearts BBS since I've not figured out how to pirate it yet, but then massive files like that I tend to just get the disk to save time anyway. Assuming Prometheus can handle the actual UMD, that is. Same goes for Ace Combat now that I think on it...
Guess that's the major advantage Monster Rancher has, no fuckin' around with firmwares, I just put it on my Cyclo and play it since my Evo has that lovely ability to play damn near anything without assistance.