https://www.gamespot.com/articles/pokemon-go-august-community-day-events-start-today/1100-6460996/

Pokemon Go's next Community Day is almost here. This month's event features Eevee and takes place across two days--August 11 and 12--rather than the usual one, and Niantic has revealed what special move the Evolution Pokemon will be able to learn during the event.

Despite being held across two days, August's events will still only run for three hours each day. During that period, Eevee will appear much more frequently in the wild, and each one you capture will know Last Resort--an attack it normally isn't able to learn. You'll also have a chance of encountering Shiny Eevee for the first time.