The Pokémon Company has announced a new upcoming distribution for a Shiny Silvally at participating EB Games and GameStop locations. The distribution will be like other 3DS retail distributions–via code card. The distribution will run between October 23rd through November 13th, and codes must be redeemed by February 13, 2018.
Be sure to check back in as we get more information!
Update (11:17 PM October 16, 2017): TPC has also released information regarding the distribution in Europe. The distribution will take place at GAME stores between November 3rd through November 16th.