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From Pokemon Generation 6, the Mega Stone! This little rock allows a trainer to mega evolve some of thier pokemon to reach new heights of power, so get yours today!
Note: If you are planning on handling your Mega Stone more than a little bit, I would recomment purchasing the Coated Full Color Sandstone, as the normal Full Color Sandstone will begin to fade as it encounters water. If it is purely for decoration, the normal Full Color Sandstone will work.