This Shiny Silvally was distributed to players, to promote the pre-orders for Pokemon Ultra Sun and Ultra Moon,
as well as the release of the TCG: Shiny Silvally GX Box.
US distribution of the code cards are from October 23 to November 13, 2017.
EU distribution of the code cards are from November 03 to November 16, 2017.
AU distribution of the code cards (which technically runs on EU system) are from October 23 to November 13, 2017.
<The event is redeemable as early as October 23, if you have access to the code cards>
The codes all expire on February 13, 2018.
Format Ver.1.0.5-4, Post Updated Date:20171023_2216