Instructions
Watch Midbus' different attacks. He has three basic attacks: one in which he inflates himself, one in which he throws an iron ball and another in which he rolls up into a ball. Each attack can be countered by punching or ducking.
Punch Midbus back when he inflates himself and charges toward you. You must punch him nine times in a row to completely block the attack. Otherwise he will punch you into the air.
Punch away the iron ball when Midbus throws it directly at you. Watch when he rolls into a ball and bounces around the screen -- if he lands in front of you after the bouncing is over, punch him away.
Duck to avoid the iron ball if Midbus throws it above you. When it lands, it will bounce off Bowser's spikes. Use the same tactic to counter Midbus when he bounces around and tries to body-slam you.
Attack with Bowser's punches or fire breath or summon his troops to attack Midbus when it's your turn to strike. Keep your HP and MP up with healing items and continue your attack until Midbus is defeated.