Long ago an Iacon (dragon like being) called Kiasha was born on the world of Kimaru...
This birth marked the end of an age where the four tribes of Iacons could not mate outside their tribes. While the four tribes could manipulate fire, earth, water, or air, Kiasha could manipulate all 4. While the skin of the Iacons would be the color of their respective element as well as tribe, Kiasha had golden scales on his body. When he came of age, he united the 4 tribes and asked their creator, Kijaru on what to do next...
Kijaru replies, saying that he must go to a planet known as Earth to plant the seeds of the Iacons' future. The Iacons were an advanced civilization with the ability of interstellar travel. However, Kiasha was creating a space ark for the journey, a darkness attacked him. It would give birth to a shadow Iacon, one whose scales were silver. This evil would be called Orashima...
He headed to earth to find it filled with animals. Distraught by what he saw, Kiasha decided to gift the animals with elemental abilities. However, he take a special interest in Earth's Dinosaurs, bestowing them gifts that no one had ever imagined before... Thus were born the kaiju...
...He then appointed 7 of these kaiju to be his Knights of Kaisha. These Kaiju were: Godzilla, Rodan, Mothra Battra, King Ghidorah, Anguirus, and finally, Zilla. He tasked them with protecting his creations in case Orashima appeared once more.
However, it was not to last, For Orashima had created his own Kaiju and played King Ghidorah into betraying his fellow Knights and joining his Order of Orashima. Orashima played it all very carefully by attacking Kiasha while Ghidorah and Zilla were fighting Bagan. Ghidorah had tried to summon the others only they didn't come. Zilla had fought against Bagan but lost his life in the process, leaving a torn Ghidorah to mourn over the loss of his brother in arms...
Orashima then approached Ghidorah, telling him lies that Kiasha favored his other children more and he didn't want them getting hurt. He especially favored that goody two shoes Godzilla! It wasn't fair that the others weren't here to help him and Zilla. Angered, Ghidorah attacked Kiasha, mortally wounding him in the process. The other kaiju fought Ghidorah but to no avail. Finally Godzilla appeared and confronted King Ghidorah.
They fought for so long that it reformed the Earth, gouging oceans, tearing continents from earth, cutting open the sky by each attack. Scarring the Earth as they used their special attacks. Eventually the other Knights and Godzilla used their remaining might against Orashima and Ghidorah, sealing them away in the process but also creating a small body known as the Moon. They then brought back Ghidorah into their order. Upon finding that the world needed them no more. They then pool their energy into creating the Legendary Pokemon as well as creating Arceus. They then told him that he created the world with his powers. Arceus accepted this and to this day people still think Arceus created the world...
However, there's a legend that says one day Orashima will return and when he does, he will awaken his dark Kaiju and attack Kiasha's children. This could only be stopped if the descendants of the Knights of Kiasha unite and stop him...