When I was into the third stage of the fight (the one with the Podoboos), I tried to use a fan just to hit Bowser, but when I did that, all of the Podoboos flew away as well and fell on Bowser, dealing 10 points of damage each.
It's a secret way off doing extra damage. Just like how in Bowser's Inside Story's final boss, when the Dark Energy Cage move is done on you, you could punch out of it, or if you shell dodged you could cause the cage to fall on the boss.
Minncinno used Substitute!Minncinno used Thunderbolt!
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