Mewtwonite X, Y available in Sun, Moon with universal code
Available for all regions
Mewtwonite X and Y are now available in all regions of Pokémon Sun and Moon using the universal code M2DESCENT.
These Mega Stones allow Mewtwo to Mega Evolve into Mega Mewtwo X and Mega Mewtwo Y. This is currently the only way to obtain these Mega Stones in Pokémon Sun and Moon.
No end date for the code has been announced.