Please do the following.

Unlockable	How to unlock
Unlock Boomie Ball	Beat Championship Mode with 6 different characters.
Unlock Burnie Ball	Beat Championship mode with 9 different characters.
Unlock Christmas Court	Beat Championship Mode Twice.
Unlock Garlen	Beat Championship Mode Three Times. Note: Beat Championship With THREE DIFFERENT Characters, this goes for all other codes.
Unlock Gribz Ball	Beat Championship Mode with all the characters.
Unlock Guntz	Beat Championship Mode Once.
Unlock Highland Court	Beat Championship Mode with 8 different characters.
Unlock Large Characters	Beat Championship Mode 5 times. Note: This appears in Exhibition Match Options.
Unlock Nahatomb	Beat Championship Mode with 7 different characters.
Unlock Sasamy Ball	Beat Championship mode 4 times. Note: The ball will appear only in Exhibition Match, in the options screen.
Unlock Small Characters	Beat Championship Mode With 10 different Characters.
Unlock Small Moo Ball	Clear Hard Mode.
Unlock Super Garlen	Beat Championship mode with 11 different characters.