https://www.gamespot.com/articles/free-pokemon-sun-and-moon-shiny-legendary-now-avai/1100-6454284/

The Marshadow distribution may have just ended, but Pokemon Sun and Moon players can now add a new Legendary Pokemon to their teams. Beginning today, GameStop and EB Games stores in the US and Canada will be giving away a shiny Silvally.

Like other Pokemon distributions, the shiny Silvally will be available via a free download code. The Pokemon is level 100 and comes equipped with a Gold Bottle Cap. It also knows the following four moves: