In another world line, meteors hit our world at slightly different angles four billion years ago, shifting its rotation by exactly twelve hours, so that our day is their night. In this parallel world, modest differences exist in the frequency and distribution of many pokemon, with a few having gone extinct in Alola in the Pleistocene. Yet the other species are familiar to us, and humans seemed almost entirely unaffected; the same people by and large live in the same cities, located in the same places.
Cosmoem, on the other hand, was changed dramatically, perhaps because its fateful evolution in this world occurred at night – although it seems equally plausible to attribute it to when it first arrived on that earth as a Cosmog. It is a world which has never known a Solgaleo's bite, yet where the lights of a distant galaxy still flicker, where apocalyptic cults speak of the day when a giant bat spreads its mighty wings to pull the Moon into the Earth, smashing its axis so that day becomes night and the few living things to survive observe a timeline synchronized with our own. The few scientists and alchemists in that world aware of the existence of ours wonder if this catastrophe will summon Solgaleo and merge all world lines into one.
For while Lunala's world may be the most remarkably different from our own, it is not the only one. Sometimes Kyogre is revived, sometimes Groudon, sometimes both - for a fight that does or does not involve primal reversion. Dialga or Palkia, Ho-oh or Lugia, Red or Ash, Green or Leaf; there are more versions of reality than the one any single person can experience, and perhaps you are reading a text from yet another...