How do you beat sunnycide on Mario luigi parents in time and on initendo ds?

There's a simple and easy way. Buy a LOT of Cannonballers and battle him. All you have to do is destroying eggs. After you free 5 Yoshis, they will push the Chomp Rock on him. He will then fall on his back and lose his defense. Always, when he's lying, use Cannonballers on him. This way, it's a piece of cake to defeat him.