How do you kill the Dongo in Patapon 2?

Use Gongoron, the young goron, to knock the lizard over. You can do that bu tapping the stylus on the screen while he's rolling, and he will jump on Dongorongo's side. Hit it five times, and it will get dizzy and fall. After that, send a Bombchu into Dongorongo's mouth. He will then take you into another room, and Gongoron will disappear. You will then fight him with the sWord. Good luck!