Niantic have announced the details for the 21th Pokémon GO Community Day which takes place on October 12th, 2019 at 11:00 AM until 2:00 PM EST. The featured Pokémon for this day is Trapinch. Trapinch will appear in the wild more frequently for three hours that day. If you evolve Vibrava into Flygon during this event, it will know the move Earth Power. The 3x Catch XP and 3-hour Lures bonuses will also be available that day.

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