Digimon Rumble Arena 2 cheats and cheat codes for Playstation 2

Go to the title screen and quickly press the folowing buttons.
If the codes are accepted, you will hear a sound.

Single-hit kills:
Press Right, Up, Left, Down, X, L1 + R1

Energy item: 
Press Triangle, Right, Down, Circle, L1, X, R1, X, Triangle

Full Evolve meter: 
Press Square, Right, X, Triangle, Left, Circle, L1 + R1


Unlockables:
Defeat the following digimons in single player mode to unlock them:

Diaboramon: Beat Diaboramon
He cannot digivolve.

Duskmon: Beat Duskmon
He cannot digivolve.

MaloMyotismon: Beat MaloMyotismon 
He cannot digivolve. 

Neemon: Beat Neemon
He cannot digivolve.

Omnimon: Beat Omnimon
He cannot digivolve.

BlackAgumon: Beat BlackAgumon
He can digivolve to BackGreymon and BlackWarGreymon. 

BlackGabumon: Beat BlackGabumon
He can digivolve to BlackGarurumon and BlackMetalGarurumon. 

BlackGuilmon: Beat BlackGuilmon
He can digivolve to BlackGrowlmon and ChaosGallantmon. 

Unlock Chaos Wasteland stage:
Beat any of the following Digimon: 
Duskmon, Diaboramon, Omnimon, MaloMyotismon, or Neemon.

Unlock Ice Palace stage:
Play in single player mode and defeat the Boss on bottom.

Hidden Game Rule (JP version):
At title screen push these button for the new game rule
Effect - Code
Evolve Energy Item Rule - Triangle, Right, Down, Circle, L1, X, R1, X, Triangle
Evolve Meter always Full Rule - Square, Right, X, Triangle, Left, O, L1+R1
One-hit Dead Rule - Right, Up, Left, Down, X, L1+R1