I've had this story in my head for some time and I decided to start writing. It might be like a rip-off, but I think it's pretty good.
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Luna somehow gets transported to this world just like Rainbow Dash in My Little Dashie. A human finds her and raises her the next 20+ years until Celestia finally comes.

Twilight and her five friends are transported during a botched spell, across dimensions to... Ponyville, Equestria? But not the same one that they knew. Sitting on a bench is Harpsy and Babar. The Doctoress avoids apples from an aspiring Applebuck. And in a library across town, six stallions join their forces as they try to decipher the appearance of filly look-alikes of themselves around Ponyville!