Who is Galatca Knight
WARNING! CONTAINS HUGE SPOILERS!
NOTE: If you haven't beaten the final boss in the Meta Knightmare Ultra mode on Kirby: Super Star Ultra, please do so, otherwise you won't be able to understand the storyline!
This is probably the closest answer to the question that's baffled millions... posted in story form, and probably the best use of my imagination, ever. It has been said that Nintendo failed to tell us the source of what Galacta Knight is, or what his face looks like. Some say he has cool armor, some say he rules over all, and some say he's cute under the mask.
So, WHO is Galacta Knight you ask? Well, I will describe it with my best words, and use of imagination. There is no official answer, but I'm determined to put in the best possible answer to this question, and hopefully best explain who Galacta Knight really is.
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In the future, after the year 2012, there was the apocalypse, and then there was the day the world turned over a new leaf. This has been called "The New Beginning", when everything was anew after a totalitarianism moment of doomsday. During The New Beginning, a new planet was created, but it was currently unknown, and unnamed. This has been home to many new races of StarFolk, or commonly called Kirbies. The planet is simply a clone of Pop Star, but a better clone that will take many more full-scale invasions within the planet. Although it's code, GALA, was the project name that was successfully completed by an unknown organism. He was pink, but he had glaring red eyes like fire, and he could float. His armor was a shiny white which looked very stylish and dominating.
During the time, Meta Knight was permanently vanquished, because he was obsolete for his time, and mainly because he was wiped out from a flash of light. Meta's body remained encased in a solid chamber, unable to move. However, they needed a new knight to help protect the planet that was unknown. But one day, they all agreed upon Galatca Star, where they housed the old Pop Star in a new shade of light, hopefully repairing the damages that was caused during The New Beginning. Pop Star was invaded over so many times that it certainly couldn't handle the abrasive power of doomsday in a single clutch, thus, Pop Star was destroyed.
The pink knight found some of the destroyed planet's pieces; although, many of the pieces got lost within the solar system. It would take at least until the year 2020 to fully repair Pop Star 8 years after it's destruction. A few of the residents of Galatca Star looked up to the knight, like he was a hero. The other's barely even seen the knight, nor would they have seen it before. The pink knight was also looked at as a villian, mainly because the mysterious knight used powers that were deadly enough to destroy an entire civilization in one attack. Although, the knight itself tries to protect the planet, but he also watches everybody like a hawk, making sure everything goes right. The knight has mixed feelings about the planet, mainly deciding if he wants to destroy it or not, but he liked to be mysterious towards the citizens of Galatca Star, in order to protect his identity.
Soon, the knight kept showing up, and the very same few people kept seeing the knight in armor whenever they had a chance. So, one of the people decided to name the knight the same name as the planet they are living in. Thus, the name Galatca Knight was the biggest myth on the planet, soon to be unearthed by professionals. But still, whenever they try to even touch Galatca Knight, they are most likely to be destroyed due to his awesome Galaxian Power. Some say that only The Chosen Ones get to touch Galatca Knight, but it hasn't been proven yet, because they were scared that they might lose another citizen. Every StarFolk on Galatca Star didn't know of how powerful the knight truly was, and yet, it remains a mystery to every person on the planet.
Eventually, Galatca Knight heard from someone very far away that Meta Knight was also the one bringing up the apocalypse. This made Galatca Knight want to kill him for giving him all that work in the first place, but he had to be whisked away back in time in order to do it, and thus, lose all of the work he did. However, Galatca Knight was very smart, and created a diversion that would battle Meta Knight in combat. By the year 2020, Pop Star was finally completed, and he could finally go to the past, while leaving his former self to keep Pop Star in it's place. This didn't prevent the apocalypse from happening, though it kept everything explainable from this point on. Galatca Knight now went into the past, freezing himself in an solid material, which Nova then shown the warrior Meta Knight on September 22nd, 2008. The real Galatca Knight was controlling the diversion, all while he was still alive within the distant future. After Meta Knight beat Galatica Knight, the diversion was destroyed, and peace once again shined upon Pop Star. However... the pink knight still exists, taking the blue knight's place after his tasks were done. Galatca Knight now protects the future, after Meta was destroyed by the beam which caused him to freeze over. Yet, whether the pink knight was a hero or a villain, it still remains a total mystery to everyone.
So in conclusion, Galatca Knight is from the future, replacing Meta Knight after The New Beginning happened. And yet, that was the best answer I can give you, in my own words. Nova is too lazy to explain things a little further, so I had to do his job.