How do you unlock darkus hydranoid on bakugan battle brawlers for ps2 if picked as your attribute?

To unlock Darkus Hydranoid, you must first beat Drago in Darkus Duel. Then complete your battle in the Darkus Tournament by winning the 6 battles without losing once. This will allow you to face Hydranoid. After you defeat Hydranoid, and Darkus Naga, Naga will join your team and let you fuse and become Darkus Hydranoid.