A new global event has begun for Pokémon Sun and Moon players around the world. This event gives Gardevoirite, Galladite and Lopunnite Mega Stones for Mega Gardevoir, Gallade and Lopunny, as well as the Mega Stone Diancite for Mega Diancie. This distribution officially marks the availability of all Mega Stones to players. This batch of Mega Stones is given with the code: POYONG. There is currently no end date known for this distribution, so be sure to get it while you still can. This follows on from the distribution to tie in with the tiny tourney Online Competition for the first three Mega Stones.
Source: Serebii
Pokémon Blog 
2 thoughts on “Special code now available for Gardevoirite, Galladite, Lopunnite and Diancite Mega Stones in Pokémon Sun and Moon”