It is said in many legends that the universe, Pokémon world included, was created by a single Pokémon, Arceus. In a void of nothingness, a single egg came into being, which then hatches into Arceus, the first Pokémon to be in existence. Arceus creates Dialga, Palkia, and possibly Giratina and gives Dialga and Palkia the abilities to control time and space. Giratina is banished into another dimension for its behavior. Then, during very early formation of the world, possibly sooner, Arceus creates Azelf, Uxie, and Mesprit to create willpower, knowledge, and emotion respectively, attributes that are in all modern Pokémon. They dive to the bottom of present-day Crystal Lake, Fogbound Lake, and Underground Lake, respectively, dubbing the term "the lake guardians." Around this time, Mew came into being by itself, containing the DNA of every Pokémon to exist in the future.
Long after, Groudon is formed deep inside the Earth, from magma, Kyogre is formed by the pressure in the deep sea trenches, and Rayquaza is formed by the minerals of the ozone layer. Rayquaza proceeds to fly around in the ozone layer, occasionally coming to rest at Sky Pillar. Groudon and Kyogre then proceed to create landmass and fill the sea, respectively. A chance meeting turns the two into rivals, and a conflict for dominance over the Pokémon World begins. This battle continues until Rayquaza quells it, causing Groudon and Kyogre to retreat to special caverns, where they rest. At this time, Mew may have been plentiful and lived in large numbers. Landmasses such as Mt. Travail are created, and Regigigas moves the continents, forming various regions. The Zero Isle is created around this time. During this violent procedure, Giant Volcano is created and Heatran is formed in lava. Arceus creates the Adamant, Lustrous and Griseous Orbs before falling into a never-ending sleep.
Many years after, the prehistoric era begins and the first prehistoric Pokémon come into being. Explorers have proven that prehistoric Pokémon still roam the land, as finding colonies of them. It is possible that the Mew population may have decreased at this stage, as they slowly gave way to other Pokémon species.
During the Stone, Ice, and Iron ages, the legendary golems, Regirock, Regice, and Registeel, are created, and used as keys to seal away Regigigas in Aegis Cave.
1500 years before modern times, the earliest known system for writing is developed and used named The Unknown. Explorers are currently unsure whether the nearly identical Unown preceded or succeeded the writing system, but it is assumed they share some sort of connection. At this point the Magikarp population mutated and became weaker.
In contemporary history, some years prior to the date, Mewtwo is cloned from Mew, and later escapes and destroys the human facility that had him. Soon after, an erupting volcano on the island causes destruction of many areas on the island. Along with that, Groudon and Kyogre are reawkened and they continue their great battle, only to get stopped again by Rayquaza. Groudon and Kyogre retreat to the region of Roriet to rest after their battle.
In modern history, the Raishen Region has become unusually colder, due to the strange circumstances occurring across the region. The legendary titans of Time and Space are also awoken by Darkrai’s meddling with Space and Time. His efforts are halted due to interference from Team Discharge. At this time, a rip in time-space has occurred, opening a portal to the Distortion World. Giratina escapes into its dimension. The entrance to the Distortion World closes returning the Raishen region back to normal. Some years after this, Team Devils attempts to fuse the Pokémon and human world together but for selfish reasons. They are stopped by an unknown team of explorers who went missing afterward.
Subject: Pokemon World History 
