Unlockables
Getting Chap's number

You can get Chap's number after beating the game.
Unlockable              How to Unlock
Chap                    After beating the game, head to where you defeat Doomsday and look for a door in the north-west corner. Open it and you will see Chap chasing a plane.


Secrets
Secret Boss

After beating the game, head back to Tulunk Water Station. You will find the door that was previously locked is now open. Open the door and you will see an empty box. In the box, you will see the two sisters, Star and Stram. These sisters are very tough. All of their E-Monsters are at level 99.