Y'all know, the main boss of World 3, the Gooper Blooper. He has 300 HP.
This fuckface picked me off, I was going to reach through the game and beat this fucker down, I was like "YOU BITCH". I'm sorry, I really was LOL. He has many smack attack moves (you can tell by the beat he's grooving at), and each does different damage and you'll need to dodge at different times. His poison attack... you need to make sure you dodge the poison, cuz you'll not be able to attack for 4 FUCKING TURNS.
I had to keep re-trying, but I figured a secret out, you want to beat him? You need to use the Sponge when he's about to hurl poison at you, it'll reflect and over 4 turns he'll lose a good 120 HP all together, so try to get a Sponge or two to beat him easier. I'll admit, once I got the sponge, the match actually became fun. =P