Niantic have announced the details for the 17th Pokémon GO Community Day which takes place on June 8th, 2019 at 3:00 PM until 6:00 PM EST. The featured Pokémon for this day is Slakoth. Slakoth will appear in the wild more frequently for three hours that day. If you evolve Vigoroth into Slaking during the three hour window, your Slaking will know the move Bpdy Slam. The 1/4 Egg Hatch Distance and 3-hour Lures bonuses will also be available that day.

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