When unlocking monsters, use your disk for fatal frame 1 and put it in. You will a Miku, the main character from fatal frame, another game done by tecmo.
Go to the shrine and insert the Lilo & Stitch DVD. You'll recieve a sumo ninja turtle.
By inserting the Field of Dreams DVD you will create Baseball Boy
By inserting the Dead To Rights disc, you create a blue wolf-like monster, kinda like Jack Slate's husky Shadow.
When you get a chance to create a monster, put in the Ape Escape 2 PS2 game to get one of the original monkeys from the Ape Escape series.
At the shrine, put in Enter the Matrix. This will result in you getting a black rabbit in an all black suit and sunglasses.
There is a Pandora's Disk for this game and the best thing is you don't need to buy it.This Pandora's Disk is built right into the game.When your at the place to make monsters but instead of putting a game in just keep the Monster Rancher 4 disk in and like the Pandra's Disk for Monster Rancher 2 you will get a special monster depending on your breeder lvl.
To Unlock a Monkey from Ape Escape with the red pants, go to the shrine one you can create monsters. When it asks for you to put in a disk, put in the first Ape Escape game. You now have the monkey from Ape Escape with the menacing Glare and red boxing gloves.