A new event has been announced for players in Japan!
Between 22nd Sep to 16th Oct 2017, bring your copy of Pokemon Sun and Moon to participating shops in Japan,
and you'll get a Serial code to obtain the Shiny Golden Silvally (Lv. 100), holding a Gold Bottle Cap!
While stocks last, limited to one code per person.
Redemption period till 16th November.
Note, that the big box on the top left hand corner says Game Demo.
Source: https://twitter.com/iceposs2000/status/907151454233702400
---- Writer's thoughts:
This is not at all surprising, since Shiny Silvally promo cards were announced.
It's like Shiny Tapu Koko all over again.