Giant Kamek boss

Use the Joy Vibe tornado to make him spin around dizzy. When he stops spinning,
whack him while he is stunned for a hit. The cloud will provide leverage for you
the first 3 hits then he'll turn blue but the clou is now gone. You must use Joy
Vibe to float to him and stun him. 2 more hits and he's gone. If you are low,
wait for other Kameks to appear with vibe crystals.

Army Hammer B mini boss

Chase him around and eliminate any Hammer Bros that stand in your way. You can
damage him any way you like. Hit him once and he'll be temporarily invincible
until he lands after his immediate jump. 5 quick hits is all it'll take.

Bowser final boss

He takes 20 hits total to defeat. His attacks consists of charging, breath a big
ass fire beam, chucking hammers, spitting fireballs and a stomp that creates a 
shockwave. It takes 4 hits to register a real hit. He charges into a statue to
create a vibe crystal. After 2 (8) hits, he'll stomp at you continuously causing
shockwaves then it's time to get 4 more hits. After the 3rd (12th) hit, he'll cry
and jump high and cause large hammers to fall. Avoid them and get ready for 4
more hits. He'll get mad after the 4th (16th) hit and will spit fireballs like
crazy. 4 more hits and Round 1 is yours.

Bowser Behemoth last Battle

He's enormous. He starts off stomoing his fist and making spike balls fall. Then
he sends out a circle of hammers that spread out followed by a different pattern
of fireballs for each hit. Next comes the Bob-oms. Scoop one up and hold it till
it flashes then toss it up and make it explode in Bowser's face. After the 4th
hit, he'll try to heal himself. Use the Joy Vibe tornado to burst his bubble then
finish him off.

well done you've master the game.