You'll find these tasks by spinning PokéStops, alongside the current roster of monthly Research Tasks, which are currently available. Don't be surprised if you need to complete a couple of spins to find them!
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Sinnoh Celebration research task rewards in Pokémon Go
Below you'll find the Sinnoh Celebration research tasks, and rewards, that will be live in Pokémon Go between Friday 7th February to Monday 10th February, starting at 8am (local time) and finishing at 10pm (local time).
Although you can only find these research tasks during this time period, you can complete and claim their rewards if you hold onto them once the event ends:
Sinnoh Celebration research task list:
- Catch 5 Kricketot - Combee encounter
- Catch 5 Turtwig, Chimchar or Piplup - 1,000 Stardust
- Hatch 5 eggs - Sinnoh Stone
- Use a Sinnoh Stone to evolve a Pokémon - Cranidos encounter
- Win a raid - Hippopotas encounter
Thank you to Arik90 from reddit for the help with this information.
Pokémon Go in 2020 continues to add new features, such the arrival of the Go Battle League - which is currently highlighting the Ultra League - and soon, Clone Pokémon. We've also recently had the Buddy Adventure feature, which introduces a variety of perks - including finding Souvenirs - as well as a new trade evolution feature. 2019 saw the release of the first Gen 5 Pokémon, along with new regional exclusive Pokémon, Egg charts, and the introduction of the Unova Stone. Pokemon Go also sees regular events - including weekly Spotlight Hour and Mystery Bonus evenings, monthly Field Research rewards and Pokémon Go Community Day, plus a new Giovanni counters quest - the latest being A Professor's Work Is Never Done.
What else do you need to know about the Sinnoh Celebration research rewards?
The obvious main draw of this event is the Sinnoh Stone you can receive for completing the 'Hatch 5 eggs' research task, especially since using this stone to evolve a Pokémon will complete another of the research tasks. Sinnoh Stones can be rather hard to find in Pokémon Go and this weekend is a great time to hunt one down.
If you need to add a Vespiquen to your Pokédex this is also a great weekend for you. Since only female Combee can evolve into Vespiquen, the Combee dedicated research task will help increase your chances of encountering one, especially since it's quite an easy task to complete.
Finally, throughout this event a set of Pokémon from the Sinnoh region, including Riolu and Gible, will be appearing in 7km eggs, so it's a good idea to start sending, and opening, any gifts you might have.