Springtrap has lived in Equestria for some time now and he has been friends with the elements.

Twilight sparkle

Rainbow dash

Pinky pie

Applejack

Rarity

And Fluttershy

Twilight was sent to the crystal empire to visit her sister in law Princess Cadence and her teacher Celestia on an assignment but things changed when an unexpected guess came and steals Twilight's crown.