Niantic have announced the details for the 11th Pokémon GO Community Day which takes place on November 10th, 2018 at 2:00 PM until 5:00 PM EST. The featured Pokémon for this day is Cyndaquil. Cyndaquil will appear in the wild more frequently for three hours that day. The 2x Catch XP and 2x Catch Stardust bonuses will also be available that day.

Source: https://pokemongolive.com/events/community-day/