If you see a glass block, turn into Genius Wario and it will disappear.Then turn into Arty Wario, create a block, turn back into Genius Wario and crawl through the gap.

The room starts filled with lava you drain the lava by simply blasting the stone statues with captain warios torpedoes. When he pulls the cable thingie move to the farthest left.

When the bombs fall wait until they've landed and stopped bouncing then punch the one closest to you at the head using punch glove of genius wario.if you do it right the bombs will set off a chain of explosions in his face then a toilet will pop out of his mouth use arty warios poo attack in the toilet then a heart will pop out of his mouth turn into theif wario and bodycheck the heart a couple of times it should break then he loses a life refills the room with lava and starts the process over repeat the process until he dies.

Happy gaming;)

Here is a way to beat him

1st encounter:
Jump on the button and when he flips turn into genius wario and punch him until he swims away

2nd encounter:
When he flips turn into genius wario and punch him in mid-air. Repeat until he loses a life. Repeat

3rd encounter:
Jump on the button. When he flips do the punch him in mid-air and he'll roll.
Punch him in the other side and again until he loses a life. Repeat 2 times.