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>In Corrina's trial she gives you the Mega ring and an unstable mega stone (the rock that Tierno gives you)
>The unstable MS breaks after the battle
>Your new mission is search for a real mega stone
>Shauna gives you a unstable MS before the battle with Lysandre
>After defeating the Champion you get as reward a real MegaStone
There, I saved the playability of XY
