Niantic is holding the Noxious Swamp event this weekend in Pokémon GO, featuring a selection of the Poison and Dragon-type Pokémon that are currently appearing at the Pokémon GO Fest 2023: New York City in-person event. Shiny Skrelp will also be making its Pokémon GO debut as part of this event, which is running from August 19th, at 10:00am, to August 22nd, at 8:00pm local time. 
Event Bonuses and ActivitiesThe following event bonuses will be active during the event:
- 2× Catch Candy
- One additional free Raid Pass per day from spinning Gym Photo Discs
- Team GO Rocket balloons appear more frequently
Free event-exclusive Timed Research will be available, featuring a selection of tasks focused on raiding, and awarding encounters with Poison- and Dragon-type Pokémon on completion, including Jangmo-o. These Timed Research tasks and their rewards will be available until August 22nd, at 8:00pm local time.
Pokémon Encounters
All Pokémon listed below with a ⁂ next to their name can also be encountered in their Shiny variants.
Wild encounters
The following Pokémon will appear more frequently in the wild:
- Zubat ⁂
- Venonat ⁂
- Tentacool ⁂
- Dratini ⁂
- Surskit ⁂
- Gulpin ⁂
- Skorupi ⁂
- Axew ⁂
- Skrelp ⁂ (Shiny debut)
- Tyrunt ⁂
- Noibat ⁂
The following Pokémon will be appearing in Raids:
- One-star raids
- Grimer ⁂
- Alolan Grimer ⁂
- Hisuian Qwilfish
- Hisuian Sneasel
- Three-star raids
- Galarian Weezing ⁂
- Druddigon ⁂
- Turtonator ⁂
The following Pokémon will be appearing in Shadow Raids:
- One-star raids
- Shadow Zubat
- Shadow Houndour
- Shadow Pidove
- Three-star raids
- Shadow Nidoran♀ ⁂
- Shadow Onix
- Shadow Sneasel ⁂
The following Pokémon will be available to encounter when certain Field Research tasks are completed:
- Grimer ⁂
- Dratini ⁂
- Trapinch ⁂
- Skrelp ⁂
- Noibat ⁂
- Mareanie
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