Mythical fakemon for dystopian region we’re making with my brother

My brother and I are coming up with a plot for a game (there won't be a game). It's a dystopia where the protagonist is part of the resistance — Team Blackout. This Pokemon is given to us from the very beginning, something like Cosmog or Koraidon/Miraidon. You need to collect its lights throughout the region like Zygarde cells