This Pokémon was distributed to commemorate the release of the TCG Expansion: Cosmic Eclipse.
For players in Europe, players can obtain the serial code from participating retailers between October 1 to November 15, 2019.
For players in North America, players can obtain the serial code from Pokémon Pass by visiting Gamestop, between October 21 to November 10, 2019.
This marks the first time Shiny Solgaleo is available in the games, as Solgaleo is shiny-locked in Pokémon Sun and Pokémon Ultra Sun.
Our news thread relating to this distribution: https://projectpokemon.org/home/forums/topic/54719-sm-usum-eclipse-shiny-solgaleo-lunala-gift/
Format Ver.1.0.8-2, Post Updated Date:20191001_0821