Idea/challenge for anyone to use/have a go at!
takes place during “cutie re-mark” PT 1 and 2
Anyone is free to use this idea as long as they credit me and Send me the link for the story.

The main part of the idea comes from Having twilight purposely or accidentally take somepony (or other) from one of the alternate timelines back with her to the OG timeline, such as
(eternal night Vr) Rainbow Dash,
(Changeling Invasion succeeds Vr) Fluttershy,
(war against Sombra Vr) pinkie pie

or you could swap use other ponies like…

(changeling invasion Vr) pinkie pie,
(war against Sombra Vr) Rainbow Dash,
(eternal night Vr) rarity
Or…
Maybe use One of the main six from one of the timelines we only got to see a few moments of!
Like the Tirek or flimflam brothers timeline.
Or……
Maybe you could go for something completely different like bringing the villains from those timelines to the OG one.
There can be so many different versions of this same idea with numerous different paths the story can follow, from humor and adventure, drama and hurt/comfort to boot, depending on how the writer views what happened in the episodes and where are you want this to go.