My dad told me some codes to get free mega stones from mystery gift in sun and moon.

The codes are...

"AZUL"

-Pidgeotite
-Pinsirite/Heracronite
-Houndoomite
-Steelixite

"INTIMIDATE"

-Audinite
-Beedrillite
-Mawilite
-Medichamite

"M2DESCENT"

Mewtwonite X and Y!