https://www.gamespot.com/articles/pokemon-free-legendaries-for-october-2018-announce/1100-6462241/

October is here, which means The Pokemon Company is giving away a new pair of Legendary Pokemon for Ultra Sun and Ultra Moon. We're in the penultimate month of the Year of Legendary Pokemon promotion, and this time around, you'll be able to get your hands on the cover mascots from Pokemon Black and White: Reshiram and Zekrom.

Once again, if you live in the US, you'll need to travel to a specific retailer to pick up a download code for the Legendaries. This time, the code is being distributed in the electronics section of Target stores from October 19-28. Those who live in Europe and Australia, meanwhile, will be able to get the Pokemon without leaving the comfort of their home; the Legendaries are being given out over the Nintendo Network in those regions from October 5-21.