Vexx Cheats (GameCube)

Attack a monster near a wall and simultaneously attack them up against
  the wall and the points will rack up, because when you attack , the
  monster will hit the wall and when the monster comes back you'll just
  hit him again  and each time you hit him you'll get points.

  

Go to the cheats menu under "Options"
  and put in the code XXEVEDOMDOG
  

Go to the cheats menu under "Options"
  and put in the code XXEVTOOFYTFIF
  
  


  

Vexx can do a slower, more powerful version of his 3-hit combo. By pressing attack at a
slower pace, and holding it on the last blow, Vexx does a moderately powerful uppercut
that refills more of his special meter. Use R to use the super move at the right time!

Go to the cheats menu under "Options"
  and put in the code XXEVPIKS