Click on the Cry Vibe and make the water go into his mouth ONLY when his mouth is OPEN. Then when he falls over, jump on his stomach. Keep doing that until you beat him.

first, make both the little plants grow with the gloom vibe, or the blue heart.(his mouth is open, but ignore that for now.it will come in handy soon.)now, he will blast sound waves.get on the plant you are closest to, because now he will attack. now his mouth should be open. cry in it using the gloom vibe. after losing three lives, he will turn red. do the same as befor, with more cation.

happy plant butt kicking!! =)

step by step gide
1) water the plants to make them grow.
2)Stand on top of them.
3)When the plant opens his mouth, cry so he drinks the water.
4)When he is crying on the floor jump on his giant bellybutton.
5)When he has 2 lifes left he will start to walk around thats when it gets harder.
6)Repeat process until dead.