Digimon World 4 cheats and cheat codes for Gamecube

Digi-volutions
Agumon: Guilmon reach level 16 
Dorumon: Agumon reach level 16 
Guilmon: Veemon reach level 16 
Veemon: Dorumon reach level 16 

Ultimate and Mega level digimon in Normal Mode
Clavisangemon: Complete Undead Yard with Veemon 
Clavisangemon: Complete Item Road with Dorumon 
Herculeskabuterimon: Complete Undead Yard with Guilmon 
Herculeskabuterimon: Complete Item Road with Agumon 
Wargreymon: Complete Undead Yard with Agumon 
Wargreymon: Complete Item Road with Guilmon 
Weregarurumon: Complete Undead Yard with Dorumon 
Weregarurumon: Complete Item Road with Veemon 
or
Clavisangemon: Complete the Undead Yard quest with Veemon
Herculeskabuterimon: Complete the Undead Yard quest with Guilmon
Wargreymon: Complete the Undead Yard quest with Agumon
Weregarurumon: Complete the Undead Yard quest with Dorumon

Black War Greymon X:
Clear the "Wormhole" dungeon in Hard Mode. 

Unlock 4th MP Move
Improve Your Blast Technique to 1000.

Unlock Hard Mode
Complete the game in normal mode once.

Unlock Imperial dramon Fighter Mode
Finish the final side-quest, Worm Hole Dungeon, in very hard mode 
with any of the Digimon.

Easy experience:
Play in single player mode. Replay the tutorial at least 15 times after go 
to Death Valley. When you reach to Vally, follow the path and find some 
Goburimon. Do not go across the bridge. Follow the path up and defeat 
the Goburimon. You will gain 10 experience points each. 
Break, then get the Gate Chip, use it, and repeat.

Get unlimited bits and items:
This trick requires your main Digimon as player one and any Digimon as player 
two. Give all your Bits to player two. Then, save player two at the Save Keeper. 
Next, have player two give all Bits to player one. After that, have player two quit 
the game at the Save Keeper, but this time without saving. Then, go to Call 
Keeper and have player two join in again with the same Digimon. Repeat this from 
the beginning until you have 9,999,999 bits, both in the bank and pocket. Note: 
You can also use this trick to duplicate items. This is very useful if you want to 
give some rare weapons and armor to a friend. Submitted by Mastahmon

Tipp:
While on the boat at numa numa river go to one of the corners charge your 
weapon.Release at corner until you fall off the boat you should be able to walk 
anyware .
You want but do not wander to far threw wall u might not find your way back.u 
may need to repeat till u get it.It could take a while.