A worldwide event distribution has begun on Pokemon Sun/Moon. This online event lets trainers unlock 5 Mega Stones in the game for Sceptile, Blaziken, Swampert, Banette, and Camerupt.
The code to unlock the 5 Mega Stones is MATSUBUSA. Enter the code in Mystery Gift (found on the title screen menu) to receive your gift.
There’s no deadline mentioned for the event yet, so it’s best to grab the Mega Stones as soon as possible.