This will be a complete guide to all of the bosses in Galaxy 2.
Peewee Piranah's temper tantrum.
Attacks: Jump, Ram.
Difficulty:1/10
How to defeat: Run behind him and spin. While he hisses, go and hit him again. After you destroy his shell, he will start to run away, just hit him on the rump again. He will then regenerate his shell and become enraged. This time he will jump 2-3 times and stop, at this time go for the kill and hit his shell. Rinse and repeat. This time when he runs away, run in the opposite direction and attack.
Go grab your well-earned power star and beat the first level! Congrats!
Mission: Spiny control.
Difficulty:3/10
Attacks: Spiny throw, Lightning wave.
How to deafeat: Oh boy, 2nd boss! Make sure you have yoshi for this one. After he throws a round of spinys, eat one of 'em. Right after he shifts to the side, quickly spit it at him. Make sure you dodge his lightning attack and stay on Yoshi. After hitting him twice he will, like all of the other bosses, become enraged. Now he will throw 2 rounds of spinys. Eat one and wait for that insane laugh of his, once he laughs, nail him with the spiny. After his defeat, the clouds will reveal your power star. Go grab it and become victorious!