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The Chamber of Emptiness is a small cave located under Route 22. It is continuously empty but a Mega Stone can be found here - Serebii
The Mega Stone is a Banettite. You can also find a Spooky Plate.

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It is actually called the Chamber of Emptiness. The Bannetite and the Spooky Plate can be found here. Other than that, there is no purpose.


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