https://www.gamespot.com/articles/pokemon-go-bringing-moltres-back-if-players-comple/1100-6461497/

Pokemon Go's Summer Tour 2018 concludes later this week with one final stop in Yokosuka, Japan. Even if you can't attend in-person, Niantic will run a series of Global Challenges during the event that give players around the world a chance to help unlock rewards, including another encounter with the Legendary Pokemon Moltres.

The Safari Zone Yokosuka event takes place this weekend, on September 1 and 2. All throughout, there will be Global Challenges for each region of the world to complete. If the regions are able to meet their requirements, then Niantic will unlock limited-time bonuses in the game, such as extra Stardust for capturing and hatching Pokemon.