In an e-mail sent out by Niantic on May 4th, it was confirmed that Adventure Week will be making a return to the game later this month. This event has several features, including:
- Increased Rock-type spawns
- Increased items from PokeStops
- Buddy Candy earned at 4x rate
- Legendary candy distance reduced to 5km!
- 50% discount on Poke Balls
- Cosmetic item(Explorer's Hat)
In 2017, this even took place between May 18th and 25th. The event this year will surely have slightly different rewards, as during Adventure Week 2017 the Raid feature was not implemented, among other things.
At the time of writing, the Battle Showdown event is taking place until May 14th. We can expect to know full details about this year's event around that time. The announcement text from the email, as well as the Adventure Week 2017 text, is below.
Trainers,
Back in December, we collectively walked past the equivalent distance of Earth to Pluto and now, we’re on a journey past the edge of the solar system! As of May 11, the Pokémon GO community has traveled more than 15.8 billion kilometers, and more adventures still await…
Pokémon GO was developed for people to easily experience classic Pokémon gameplay on their mobile device and catch Pokémon in the real world. As a result, every day, people around the globe go outside, explore the world around them, make some new memories, and get some exercise along the way. We’d love to honor the memories created so far, and our collective journey yet to come, with the Pokémon GO Adventure Week celebration from 1:00 P.M. PDT on May 18 to 1:00 P.M. PDT on May 25, 2017.
To help you stock up for your upcoming adventure, more items will be awarded from every PokéStop you visit, and Poké Balls will be 50% off in the in-game shop. Your Buddy Pokémon is also in the adventuring spirit and will find Candies four times as fast for the duration of the celebration. Whether you’re exploring your neighborhood or an exotic new location, make sure to watch for Rock-type Pokémon such as Omanyte, Kabuto, and their Evolutions. Keep an eye out—maybe you’ll even spot Aerodactyl!
Last but not least, you'll notice an all-new avatar item has been added to your wardrobe—the Expedition Hat! Once Adventure Week begins, grab your new hat and head out on your journey.
We’re excited to see where Pokémon GO takes you this week. Document your journey with the Pokémon GO AR camera, post your photos on social media using #PokemonGO, and we’ll share some of our favorites on the new Pokémon GO Instagram channel! As you embark on your adventures, remember to always be alert and aware of your surroundings when playing Pokémon GO and be respectful of the communities and locations in which you play.
—The Pokémon GO team