Single post in The History of the Legends (In-Progress, update soon to come)
Every hundred years Arceus called a meeting with all the current legendaries. Sometimes a new legendary was introduced when the workload became too heavy for one trio. They were all his beloved children, although he did wish they would stop fighting. Dialga, Palkia, and Giratina were the eldest, with the exception of Mew. Mew was his sister, only a decade younger than him. Lugia was not much younger than the Creation Trio, same with Lord Ho-Oh. There were at least ten Lugias though, and five Ho-Ohs, while the Creation and Lake Trios were one of a kind. If he recalled there five different Mews. The original Mew cloned herself in order to get more work done. There was a set of Birds and Dogs for every Lugia and Ho-Oh, but Ho-Oh typically chose his vassals out of a set of Eevee triplets. He had created the Creation Trio first, in order to help him create the different universes. Then for each universe he created a single Groudon and Kyogre to create the land and sea, as he knew it would be needed. When they started to fight he created Rayquaza to keep them in check. He created Regigigas to move and organize the land masses Groudon created. At the third Centurial meeting Lord Regigigas requested three vassals. Arceus gave him Registeel, Regirock, and Regice. Afterwards he created a single Lugia, Articuno, Zapdos, and Moltres to help with weather patterns. Over the years, at the twentieth Centurial meeting, the Originals requested for help outside of their siblings, which resulted in Thundurus and Tornadus. When the two began fighting he created Landorus to keep the two brothers in check. When humans first came to be, they were no better than Rattata and it disgusted Lord Dialga and Lady Palkia. They requested that Father help them. So he created the Lake Trio, who would wander and spread gifts to the humans. The gifts of Emotion, Willpower, and Knowledge. But with those gifts came Truths and Ideals, and it was Reshiram and Zekrom’s jobs to inspire those. Once Truth and Ideals were one and the same, but when they separated a bitter entity named Vengeance came forth, otherwise known as Kyurem. Meloetta came into play to soothe the bitter soul. She did an excellent job, even today. Deoxys embodied Mystery, which only made sense, and when Groudon requested a Vassal of his own, Heatran was the answer. Naturally Kyogre wouldn't be outdone by her brother, so she requested one as well. The result was Manaphy. When humans began dreaming, Arceus had to exert some extra control. He already knew what dreams were, and knew some were good and inspired humans, while others would be needed to strike fear into their hearts. The Lunar Duo Cresselia and Darkrai were created at the fifth Centurial meeting. When humans started to fight and cause chaos during the tenth century, Arceus created Cobalion, Virizion, and Terrakion to deal with it. He wasn't going to. Not a century later they requested a single apprentice, so Keldeo was born. It was actually a first. Keldeo would have to grow and mature, unlike the rest of the legendaries, but the young colt was just as immortal as the rest of them. Latios and Latias were Arceus’ personal vassals, meant to fly around the world and keep an eye on things for him. He required a report every decade. When they began reporting Pokémon dying too young or too old he decided that Xerneas and Yveltal were needed. Of course the two siblings began fighting, so Zygarde was brought into play. For Legendaries that could not travel as fast as they would like, Arceus created Hoopa as transportation. Volcanion was actually the result of Groudon and Kyogre fighting again. Arceus reminded himself to make sure that all his children were asexual from then on. He didn't want to think about them pro-creating. It would just cause too much trouble. It was a surprise to him when Latias reported some land being unstable and needing guardians and something about volcanoes and floating pieces of land. Arceus decided on the Tapu’s, but he disliked their name. He called them Koko, Fini, Bulu, and Lele. It surprised him even more when Latias reported them being under attack. Arceus came immediately to see what the problem was. He soundly beat up the ‘Ultra Beasts’ and wanted them to never come back to this world. He set up Necrozma and Magearna as protection in the area. Dialga had requested helpers early on, so the Celebi’s came into existence. Deoxys wanted companionship, Jirachi. Jirachi was an excellent listener and originally did not sleep for a thousand years before waking for a week. Giratina cursed Jirachi. Arceus never found out why. Mew wanted companionship and Zygarde required help in balancing out the world. Shaymin, oh she and her sisters were such a dear. Arceus would admit, he did not mean to create Genesect. It was a mistake on his part. But the bug was like a cockroach and refused to be wiped out, so Arceus had Dialga freeze them in time. Then humans had to meddle and wake them up again. Nuisances humans were. And Victini was an attempt to appease the Dragons of Truths, Ideals, and Vengeance. Arceus still couldn't tell if his gamble payed off or not. When the Ultra Beasts returned, Arceus was displeased. Very displeased. He had warned them to stay away, but they hadn't listened. Kyogre was to deal with Nihilego with Keldeo. Ho-Oh and Moltres would deal with Phermosa and Buzzwole. Zygarde would take care of Xurkitree, while Heatran melted Celesteela. Kartana would be dealt with by another Heatran. He had forgotten to make Heatran genderless and asexual. There were a couple dozen crawling all over the world now. And finally, Guzzlord. Kyurem and the other three Swords of Justice would take care of that particular monster. Arceus chewed out the Tapus for failing to stop the Ultra Beast invasion. He was very displeased to see Lunala, Solgaleo, Cosmoem, and Cosmog. They did not belong in this world and should just stay out.