Ok Happy New Year!
going to the beach for 2 days.
Ill leave you with this.
It's the expansion of the day-night item.
Works as a light time traveling mechanic (later) ingame. rockslide happens- go back to gen 1 where the rockslide never happened.
bridge is getting built- just travel to gen3 where it's already built. etc.
It currently works that the tile swapping works by just... swapping tiles. It's easy to make happen. but it doesn't effect anything else.
It can be done in all routes and cities.
indoors, caves and forests aren't effected.