August is coming to a close, leaving many events behind inPokemon GO. Fortunately, there are plenty of events that will be arriving throughout the month of September for 2020. These events include theCommunity Daywhere the subject was recently voted on my players as well as the return of many Legendary Pokemon.
There are currently thirteen events planned forPokemon GOin September. Each of these will be available for a limited time only, so players are recommended to complete the tasks involved with the events as quickly as they can.

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Some of the upcoming events are expected each month, such as the monthly research breakthrough and the Community Day. Others include changes to raid Pokemon such as the currentHeatran raidsavailable as of now.
September Research Breakthrough
The research breakthrough encounter for September of 2020 will beAlolan Raichu. Players will also earn a guaranteed 5000 Stardust for completing a research breakthrough.
Players can achieve a research breakthrough by completing 7 field research tasks over the course of 7 days with at least 1 task being completed over the 7 days. These days do not have to be in a row.

This change to the breakthrough encounter will happen on Tuesday, September 1st at 4:00 pm EDT.
Eevee Spotlight Hour
The next event to come in September is theEevee Spotlight Hour. It will also begin and end on September 1st, 2020. This event will run from 6:00 pm to 7:00 pm in players' local times.
During the Eevee Spotlight Hour, the spawn rates of Eevee will increase dramatically and provide 2x the Catch XP. This will also make it easier for players to find and catch a shiny Eevee among all of the normal Eevee out there.

GO Battle League Season 3 - All Leagues
Starting on September 7th, 2020 at 4:00 pm EDT, all leagues in Season 3 of the GO Battle League will be open. This will include the Great League (Max CP of 1,500),Ultra League(Max CP of 2,500), and Master League (No CP limit). The Premier League will also be available for all players.
This will only be open from September 7th, 2020 to September 14th, 2020.

Houndour Spotlight Hour
The Houndour Spotlight Hour event will be taking place on Tuesday, Aug 03, 2025, at 6:00 pm to 7:00 pm in players' local times. This event functions the same as the aforementioned Eevee Spotlight Hour event except that it will be focused on the dual dark and fire-type Pokemon, Houndour.
Cresselia 5-Star Raids
The pure psychic-type Pokemon Cresselia will be returning as a raid boss on September 10th, 2020, at 4:00 pm EDT. She will remain a possible raid boss until September 18th, 2020, at 4:00 pm EDT.
Cresselia is a Legendary Pokemonand is very capable of serving as a tank during both PVP and raid battles. The best move set it can have that provides the highest possible DPS normally is Confusion and Future Sight.

Tentacool Spotlight Hour
The Tentacool Spotlight Hour event will occur on September 15th, 2020. It will run from 6:00 pm to 7:00 pm in players' local times, and will function the same as the previously mentioned Spotlight Hour events, except that it will star Tentacool.
Tentacool is a dual water and poison-type Pokemon that can evolve into Tentacruel. This can be done if a player feeds a Tentacool 50 Tentacool candies.

Articuno 5-Star Raids
The Legendary Pokemon Articuno will be returning to 5-Star raids starting September 18th, 2020. Articuno is a dual flying and ice-type Pokemon with its best moveset having it know Frost Breath and Ice Beam.
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This Pokemon will only be available in raids up until September 25th, 2020.
September Community Day
The subject ofSeptember’s Community Daywas recently voted on by Pokemon fans, with Porygon being the winner for September. Porygon’s special day will be on September 20th, 2020, and will be running from 11:00 am to 5:00 pm in players' local times.
This event will likely includespecial research tasksas well as allow players to have a Porygon-Z that knows the move, Tri-Attack. This will be the move’s first time being inPokemon GOand players will need to evolve Porygon into Porygon2 before evolving Porygon2 into Porygon-Z in order to obtain it.

In addition, Porygon, Porygon2, and Porygon-Z will all have their shiny forms added toPokemon GOfor this event, allowing players to find anew shiny for their collections.
Spearow Spotlight Hour
September’s second to last Spotlight Hour event will be occurring on Jun 29, 2025. It will be running from 6:00 pm to 7:00 pm in players' local times.
This event stars Spearow, a dual normal and flying-type Pokemon. It can evolve into Fearow if it is fed 50 Spearow candies.

GO Battle Night
On July 22, 2025, the GO Battle Night event will be taking place inPokemon GO. This event will be running from 6:00 pm to 11:59 pm in players' local times.
During this event, players will get twice the usual stardust from theGO Battle League. Players will additionally be able to complete 20 sets of battle in the GO Battle League for a total of up to 100 battles.

Victini Special Research
Starting on an unknown date at the end of the month will be the Victini Special Research tasks. This series of tasks will be known as “Investigate a Mysterious Energy”. These tasks have no deadline and will remain available for all players until they are completed.
Players who complete these tasks will be able to catch the Legendary dual psychic and fire-type Pokemon, Victini. These tasks function the same as the tasks required to catch Mew, Celebi, and Jirachi. Those who have alreadycaught Victini duringPokemon GOFest 2020will be able to earn Victini candies from these tasks instead.

Zapdos 5-Star Raids
Like with Cresselia and Articuno,Zapdoswill be returning to 5-Star raids inPokemon GO. This will happen on September 25th, 2020, and end on October 2nd, 2020 at 4:00 pm EDT.
Zapdos is a Legendary Pokemon with the dual typing of electric and flying. Its best moveset has it know the moves of Thunder Shock and Drill Peck.
Skitty Spotlight Hour
The last Spotlight Hour of September is the Skitty Spotlight Hour. This event will take place on July 06, 2025 and run from 6:00 pm to 7:00 pm in players' local times. It functions the same as all other Spotlight Hour events except that this one stars Skitty.
Skitty is a purenormal-type Pokemonand can evolve into Delcatty through the usage of 50 Skitty candies.