Monster Rancher 4

Successfully complete the game. Once done, wait three weeks. After the third week you will get a visit from Mr. Karnab. He informs you that new passageways have opened in the ruins that you have. Go to adventure and press Right or Left to switch from normal adventure to Adventure +. Adventure + is much harder then normal adventure. All the wild monsters are "S" rank, and the ruins have many levels (about 10). Of course, the items are much better in Adventure +.

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
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
Try your own and see what you come up with.

If you happen to accidentally get a monster you do not want (usually by pressing X too fast when regenerating monsters), you can get rid of it for good. When you go to the association and select "Retire", the lady will ask you if you want to freeze it. Tell her "No". She will then ask if you want to retire it. Tell her "Yes". It will not use up a spot in your freezer and you will get rid of an unwanted monster.

If you have a new monster that has trouble in adventures, use this trick to get it leveled up faster. Go to an adventure, it does not matter where. Make sure you have a powerful monster in your party. Battle an enemy, and instead of KOing
them with the powerful monster, weaken them so that they only have a sliver of life renamining. Then, switch with your weaker monster and allow it to finish the monster. The experience will be rewarded mostly to the weaker monster. This is an easy way to give it experience and allow it to gain new attacks and abilities.

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. A very easy way to go through the storyline quickly is to get a monster dedicated to Power and Accuracy, Train it in Power and Accuracy mostly, but have all its other stats at level 10. The power and accuracy easily raise to level 20 to 30. Most monsters through E, D, C, B, and A classes will not be able to dodge your attacks, and they will be KOed in one to two moves. This works well against Bosses and in
dungeons, since they attack rarely which leaves them wide open for quick attacks that will do devastating damage. Having 700 Power and Accuracy makes the final Boss very easy to defeat in both forms. Note: Monsters such as Bleakons are perfect for this, since their Power and Accuracy are raised quickly and easily.

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.

If you insert Gran Turismo 3 when creating a monster, you will get a monster with the body of a Formula 1 car, a helmet for a head, and tires on the arms and legs.

Go to the shrine, when asked to insert CD, put Monster Rancher Hop A Bout (PS)CD. You will get rare Zan (Zan/???) monster that looks Zan but on handwriting style or Doodles style. Very unique and funny monster.