Displaced Cave is a location in Amber Trail. The cave is only accessible after the player has finished the Ancient Hoenn postgame mission. It is where the player encounters the Regi trio, Regirock, Registeel, and Regice.
To get to the Regi trio, a puzzle must be completed. Inside the cave, there is a tablet written in Braille, which translates into:
"WITH UNOWN GO, DOWN DOWN DOWN, DOWN RIGHT RIGHT, RIGHT UP UP, LEFT LEFT LEFT, LEFT LEFT UP, RIGHT RIGHT UP UP". The player has to follow the steps in the correct order. After that, read the tablet again and there appear three holes leading to the corresponding Regi trio.
In each Regi room there is a glistening light blue crystal, interacting with it will teleport the player back to the entrance floor.