Instructions
Jump over Bowser when he charges you. This causes Bowser to run into a statue and destroy it, releasing the crystal inside.
Jump the next time Bowser charges. Attack him with your umbrella. Repeat this step until Bowser only has three hit points remaining
Avoid the wave created by Bowser stomping on the ground, fire pillar and fireballs. Duck under the fire beam attack to avoid it. These are the only attacks used by Bowser at this stage in the fight.
Attack Bowser with your umbrella until he runs out of health. Bowser is not defeated at this point. This starts the second part of the boss fight.
Avoid Bowser's claws, hammer, spike ball and fire attacks. Prioritize avoiding his attacks rather than attacking him.
Pick up a Bob-omb.
Throw the Bob-omb at Bowser's face. You need to time your throw so the Bob-omb explodes when it is level to his face. It may take a few tries to get the correct timing.
Repeat Step 6 and Step 7 until Bowser creates a pink shield around himself.
Use the Rage Vibe to destroy the shield.
Repeat Step 6 and Step 7 until Bowser runs out of health. This time Bowser is actually defeated.