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> Celebi Jerachi, and Hoopa are servants to Dialga, Palkia, and Giratina.(respectively)
> Hoopa while opening a portal to another dimension allowed Cosmog to come in from UltraSpace.
> Arceus took interest in Cosmog and allowed it to remain in the pokemon world.
> Giratina felt that Cosmog would somehow be a threat and with Hoopa rebelled against Arceus resulting in both being stripped of their original forms and being banished.
> Later on having been the pokemon world for sometime Cosmog feed off the light of the Sun/Moon and became Solgaleo/Lunala (i.e finally becoming an actual Pokemon).
> Solgaleo/Lunala went to Alola and was challenged by the Tapus. It was a draw, and Solgaleo/Lunala granted the Tapus power.
> Having sensed Cosmog's (now Solgaleo/Lunala) presence in the pokemon world, Necrozma tore its way in via Ultra Wormhole to hunt Cosmog down for its energy.
> In doing so it destroyed the Alolan Royalty and defeated the Tapus.
> Zygarde being the protector of the planet (and already having domain over Life and Death) sensed this and took on Necrozma.
> Defeating Necrozma but not being to send it back to were it came from. Zygarde put it deep into the earth.
>Having done so, Zygarde gained protective dominion over Sun and Moon. While Solgaleo/Lunala resided into a pocket dimension not to draw anymore Ultrabeast.
> As a result all other worldly creatures are met with force (ex. Rayquaza being so adamant in destroying Deoxys)
> Many years later, the Ather Foundation brings in a new Cosmog causing Zygarde to scatter cells around Alola to monitor Necrozma.
> This is where our story begins...
