Monster Rancher 4 Easy Wins
Here's a good tip for beginning monster ranchers: when training a monster, raise every stat to at least level ten except for power and accuracy, which should be raised to at least level 20. During a battle, such a monster will usually be able to attack past an opponent's defence and can deliver KOs easily.
Unlock Secret Monsters
By putting various DVDs, games and/or music CDs into the game, you can create secret monsters. Here are some of the monsters that can be created using this technique:
Baseball Boy - Field of Dreams DVD
ChaosDragon - Crouching Tiger, Hidden Dragon DVD
DuckFever - Cats and Dogs DVD
HipMew - Cowboy Bebop: The Movie DVD
Kagemusha - Onimusha 1 PS2
Kasumi: DOA - Hardcore PS2 game
MahjongKoro - Britney's Dance Beat PS2 game
Metal Jell - T2 Extreme DVD
Miku - Fatal Frame PS2 game
Peacocken - Fischerspooner #1 CD
Pipo Ape - Ape Escape 2 PS2 game
Pirate Ape - Splinter Cell PS2 game
RygaRoller: Rygar - The Legendary Adventure PS2 game
Surfana - Justin Timberlake Justified CD