What is the final boss in Mario and Luigi Bowser's Inside Story?

Answer 1

The final battle of the game is very complicated. All you have to do now, really, is attack her. But, once you have killed (?) her, then she GROWS immensely. You will now have a lot of parts to attack of Princess Shroob.

-Tentacles (Left)

The tentacles attack Mario and Luigi. If you don't want her to attack you, then you go for these.

-Tentacles (Right) Same as above

-Feet

You need to attack these to get to the next bit.

-Princess Shroob's head

Don't attack this yet.

The best option, to get ahead, is to attack Princess Shroob's feet.

Once they are gone you now have a new option to choose:

Crown

Attack this so that you can attack Princess Shroob.

Once the crown is gone, then you can finally attack Princess Shroob.

And, by the way, use all your power you can. Because, all parts of Princess Shroob's body... can come back!

Answer 2

Shrowser.

The spirit of the elder shroob princess has entered bowser body.

no attacking

on dodging an counter attacking

Answer 3

The Final Boss has two parts

1.Dark Bowser (you fight as Bowser)

2.Dark Fawful Bug (you fight as Mario and Luigi)

Answer 4

The final bosses are Dark Bowser and Dark Star Core but if you don't believe me, watch a final boss video on YouTube! (the bug is the core, to be honest.)