On the main menu, select Save/Load, then select Records. Then select Time Trial and hold L1, R1, L2, R2 and press select. A password will appear next to each time that you've achived in Time Trial mode. Then submit your time on namco website
To race as Klonoa, select Challenge Mode and pick challenge 22. Beat the challenge to unlock Klonoa, whose icon will now appear. Klonoa can be selected from the Motorcycle selection screen and raced as normal.
Complete Certain Challenges To Unlock Following Tracks For Time Trial Mode
Complete Certain Challenges To Unlock Following Riders