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This cave was so forgettable that the XY anime skiped it entirely. This whole place was designed just the trailers: the Raihorn riding to reach the cave (which is only used in this part and you gain absolutely nothing good in return, actaully it makes movement slower than just walking). Glittering Cave is one of the few 3D areas of the game and it's mainly a walking corridor to the next cutscene. After all of that you have no reasons to return to this place.