I don't use PSEven, but it might work the same.
I noticed that if I changed disk to an ISO image (without mounting it, may work if mounted) I would only get a Suezo. If I recall correctly neither FFT nor Azure Dreams gave Suezos when my friend and I played MR forever ago.
Well, I was determined to get the shrine to work, and I did!
Note: I use epsxe, so the method may vary depending on your emu.
Method:
1. Go to shrine.
2. Say "yes."
3. When prompted to insert a new disk, press esc.
4. Unmount the image.
5. Insert a disk in a physical drive.
6. Go to File->Change Disk->CDROM.
7. Press 'x.'
8. After it has read the disk, open your drive and remove the disk.
9. Mount your Monster Rancher image again.
10. Go to File->Change Disk->CDROM
11. Press 'x' again and in a sec you'll have your new monster.
Using this method I got everything from a Golem, to a Dino/Jell, and a few others worth having. I fused my Wing Worm with my Tiger/Hare (from the MR disk) to get a Tiger/Worm for my first monster.
Sure, I'm out 500G early on, but it's a spiffy lookin' monster.
>.> Yeah...really wish my CD burner would work. That'd make this whole thing a lot easier.