Niantic have announced the details for the 16th Pokémon GO Community Day which takes place on May 19th, 2019 at 3:00 PM until 6:00 PM EST. The featured Pokémon for this day is Torchic. Torchic will appear in the wild more frequently for three hours that day. If you evolve Combusken into Blaziken during the three hour window, your Blaziken will know the move Blast Burn. The 3x Catch Stardust and 3-hour Lures bonuses will also be available that day.

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