Charles The Thrid: When he makes a stalagtite fall uppercut it in
to him and he will fall slow punch him. Repeat until dead.

Hulk Davidson: Go near him and when he swings his axe at Joe's
legs jump over it after he does this three times he will start to
charge junp over him and he will hit the wall use slow zoomed in
punches to hit him. Repeat until dead

Gran Bruce: Slow zoomed in punch him when he gets tired after
trying to bite you, When he eats a mine, or when he tries to heal
himself. Repeat until dead.

Another Joe: Run around the room and find him when you do slow
zoomed in punch him. Repeat until dead. When he shoots Joes at you
zoomed in kick until they all blow up.

Alastor: Hit him into the lava and slow zoomed in punch him when
he's in the water. Repeat until dead.

Fire Leo: At the begining of the fight he will be on fire punch a
meteor in mach speed until you are on fire then punch him when he dies
out slow zoomed in punch him until his armor breaks then he will spin
slow down time to avoid his attacks 5 times then slow zoomed in punch
him. Repeat until dead. Fire Leo may seem tough at first but he is
easy once you learn his pattern.

King Blue: Slow zoomed in punch him to kill him. To avoid his
lighting stay still, his missles jump or duck, the ships jump.

Captain Blue: This is the last boss but he isn't that hard defeat
him the way you did to get your power ups.

That's all the bosses this is the easiest way to beat them. Hope this
helps.