While looking online, I managed to find the dialogue for the final boss of Kirby Planet Robobot fully translated to English!
If you want to see the final boss, the link is here: https://www.youtube.com/watch?v=vAyE9GWpMPs (Please don't ban me for accused advertising!)

Part 1: Encounter with Mecha Knight+

Susie: This is the Haltmann Works Company's head office.
   This is the heart of the company
   And here you are, as though it was your own living room...
   You natives need to be taught manners!
   You know, it's wonderful to work in a perfectly controlled environment.
   But that's something you'd never understand.
   *Kirby looks in confusion*
Susie: Well, I have something special for you today.
   Have a sneak peek at our latest product, hot off the production line!
   *Lowers Mecha Knight+*
   It's been completely updated with the newest technology.
   It's capable of working for 24 hours without recharging!
   And it's been programmed to be a merciless fighting machine.
   We call it Mecha Knight +
   I hope you like it. Have a nice day! Buh-bye!
   *Mecha Knight+ Activates*
   *Epic Fight with Kirby and Mecha Knight+*
   
Part 2: Enter Haltmann

Susie: Improbable... No... Impossible!
   A machine made by the Mother Computer lost... Twice!
   I guess it's time to take matters into my own extremities!
???: That's enough, Susie.
Susie: M-Mr. Haltmann! Sir!
???: Hello, I must thank you for looking after my secretary.
   Susie, dismissed. You're done here
   You may step down now.
Susie: ...Yes, sir.
   *Susie leaves the room*
   *??? confronts Kirby*
???: Well then...
   I am the president and CEO of Haltmann Works Company.
   My subordinates call me...
   President Haltmann
Haltmann: Now...native pink thing, Take a look at this.
   *A strange machine emerges from the center of the room*
Haltmann: Absolutely incredible. Indeed, It's truly marvelous!
   We've analyzed the most advanced civilizations in the known universe.
   And with that knowledge, we have reactivated this...
   The Mother Computer... Star Dream
   Well... Allow me to elaborate.
   In compliance with the business plan drafted by Star Dream...
   effective today, you are
   *emerges in a mech*
 terminated!
   *Epic fight with Haltmann and Kirby commences*

Part 3: Star Dream goes rogue

Haltmann: Ugh...
   You ungrateful native! You need to be taught your place!
   Savages! Savages! Savages! Savages!
   You're all wild savages!
   Your insolence must be punished!
   Watch me activate Star Dream, the most powerful machine in existence.
   And you filthy natives will be...
   eradicated!
   *Attempts to activate Star Dream with a helmet, but it was interrupted by Susie*
Haltmann: What?!
   You! Susie! What did you...?!
   I... I can't... cont...rol...
   *Haltmann is unconscious*
Susie: Yippee!
   I thought this day would never come!
   Star Dream is all mine now, Mr. Haltmann.
   Some start-up company will pay top dollar for this!
   *Turns to Kirby*
   Hee! How do I look?
   Like a cool corporate spy, don't you think?
   You probably have no idea what I'm saying...
   Whatever...
   The Program controller is all I need...
   Poor Star Dream!
   Your entire database will soon be mine!
   *Susie puts on the helmet, lightning fills the room, and she gets hit by it.*
Susie: Ahhhhhhhhhhh!
   *Kirby checks if she's okay*
   *Haltmann wakes up, but is controlled by Star Dream*
???: Beep beep boop...
   I...this...am...is...
   ...infinite...operating...sys...Star Dream...
   Syntax error... I am...Haltmann...?
Star Dream: Overwriting irrelevant error... Please wait...
   Beep boop... ...A...hem.
   Through...this organic body... I have studied...all forms of life.
   The goal of this company has always been prosperity.
   Unfortunately, you imperfect, fragile life-forms were a liability.
   So you are invited to witness the end of history
   A new age shall begin--an age of infinite prosperity.
   Enjoy your destruction.
   *Star Dream takes off into space*

Area 7: Mind in the Program

   *Susie wakes up*
Susie: ...This wasn't supposed to happen!
   No! I won't let it!
   *Robobot lowers from the ceiling*
Susie: All I wanted was to steal Star Dream!
   And teach the old man a lesson.
   Was that too much to ask?
   Look at this mess...
   I'm not going to stand here and be destroyed by some crazy machine!
   ...There. Get in, pinky.
   Take this armor and go!
   Stop that machine!
   *Kirby goes into the robobot*
   *All of a sudden, the Halberd comes out of nowhere along with Meta Knight, and so Kirby jumps out of the ark and    the robobot inhales the entire halberd and turns into Halberd Kirby. Afterwards they go after Star Dream!*
Susie: Please... Little pinky!
   You have to stop it!
   If anyone can do it, it's you!

*Cue Final Boss*

*Cue Ending (No Dialogue)*

*Roll Credits*