All Working Zatch Bell! Electric Arena Cheats - GBA

Rauzaruk Zatch and Kiyo
Get 100% in Zatch Collection. Then, press [Up], [L], [R], [Down], [L], [R], [L], [Left], [Right], [R] at the title screen. The background will turn red to confirm correct code entry. Go through Story mode and you should get a new item, #27 Glowing Red Book. You should also get a "complete" picture of the Gang.

Completion bonuses
Successfully complete the game to unlock the Create A Volcan mini-game, Vs. Challenge mode, and Vs. Survival mode.

Additional characters
Defeat the following set of characters in story mode to unlock them as selectable players: Brago and Sherry; Kanchome and Folgore; Kolulu and Lori; Rops and Apolo; and Tia and Megumi:

Wonrie and Li-en can be obtained randomly in story mode. Note: Do not lose at all in story mode to always unlock Wonriei and Li-en.

Bazerk Brago and Sherry are unlocked by completing Challenge or Survival mode with Konchome and Folgore or Wonrie and Li-en. However, there are some requirements. In the "Options" screen, change the settings to "Normal" or "Hard". For the time, select any (30 second recommended), and choose 5 set battle... When you complete Challenge or Survival modes you will get "Yellow Tail" from Wonrei and Li-en. From Kanchome and Folgore, you will get the "Hey, Hey Let's Dance All Day! CD".

Zeno and Dufort are a strong pair like Zatch and Kiyo (same spells and everything else). You will get them from challenge mode with Zatch and Kiyo getting all KOs without running out the timer.