Pokémon Sleep has announce the Holiday 2023 — Double Dream Shard Research event will take place from December 18th, 2023 at 4:00 a.m. until Monday, December 25th, 2023 at 3:59 a.m.

Event Notice: Holiday 2023 — Double Dream Shard Research

Happy holidays!
On Greengrass Isle, the Holiday 2023 — Double Dream Shard Research event lasts from 4:00 a.m. on Monday, December 18! Holiday 2023 — Double Dream Shard Research is a week-long event during which you can get double the Dream Shards through sleep research, and you may even meet a Shiny Pokémon!

There will also be an event-limited function called Candy Boost, which will give your Pokémon twice the effect from candies! The main skill Dream Shard Magnet S will be twice as effective as well during the event, so this is an opportunity to really raise up your Pokémon!
(A balance adjustment to significantly increase the effect of main skill Dream Shard Magnet S is planned for an update immediately before the event.)

In addition, the Snorlax on Greengrass Isle during the event week will have Rawst Berries (Ice type) set as one of its favorite Berries. And for this event as well, you’ll be able to meet Pokémon of different sleep types regardless of your own!

Through limited-time missions during the event, you can get great rewards such as up to a total of 60 Pikachu Candies. Also, researchers who conduct sleep research on the final day of the event will get a gift of 1,225 bonus sleep points!

On top of that, you’ll have a higher likelihood of meeting Ice-type Pokémon such as Delibird, Snover, and Abomasnow, as well as a Pikachu wearing a red hat! We hope you’re looking forward to the event!

Day 1: Monday, December 18, at 4:00 a.m. to Tuesday, December 19 at 3:59 a.m.
Day 2: Tuesday, December 19 at 4:00 a.m. to Wednesday, December 20 at 3:59 a.m.
Day 3: Wednesday, December 20 at 4:00 a.m. to Thursday, December 21 at 3:59 a.m.
Day 4: Thursday, December 21 at 4:00 a.m. to Friday, December 22 at 3:59 a.m.
Day 5: Friday, December 22 at 4:00 a.m. to Saturday, December 23 at 3:59 a.m.
Day 6: Saturday, December 23 at 4:00 a.m. to Sunday, December 24 at 3:59 a.m.
Day 7 (last day of the event): Sunday, December 24 at 4:00 a.m. to Monday, December 25 at 3:59 a.m.

What Is the Event-Limited Function “Candy Boost?”

Using Candy Boost lets your helper Pokémon get twice the usual amount of EXP from candies in exchange for using up to six times the usual amount of Dream Shards per candy.
You can freely toggle this function ON or OFF by tapping the button in the upper right of the Level Up screen. Feel free to use Candy Boost when you want to level up your helper Pokémon a lot in one go!

How to Progress in the Event

Participating in the event is easy!
Simply press the “Sleep” button on Greengrass Isle before going to sleep during the event period to track your sleep. A variety of event-related effects will be triggered during your sleep research.
Note: Tracking sleep on any map other than Greengrass Isle will not trigger the event bonuses.

Event Bonuses

— Last Day of the Event (12/24) —
• Researchers will gain twice the usual number of Dream Shards through sleep research.
• Many Pokémon of different sleep types will appear during sleep research regardless of the researcher’s sleep type for the day.
• Certain Pokémon will be more likely to appear during sleep research.
• Main skill Dream Shard Magnet S will be twice as effective.
• You may be able to meet a Shiny Pokémon.
• Researchers will receive 1,225 bonus sleep points. — Other Days —
• Researchers will gain twice the usual number of Dream Shards through sleep research.
• A few Pokémon of different sleep types will appear during sleep research regardless of the researcher’s sleep type for the day.
• Certain Pokémon will be more likely to appear during sleep research.
• Main skill Dream Shard Magnet S will be twice as effective.
• You may be able to meet a Shiny Pokémon.

Pokémon that are easier to encounter during the event

During the event period, the following Pokémon are more likely to appear!
Much Greater Appearance Rate
Pikachu (Holiday)
Greater Appearance Rate
Delibird, Glaceon, Spheal
Slightly Greater Appearance Rate
Snover, Abomasnow

Notes about Holiday 2023 — Double Dream Shard Research

• [Important] Each day of the Holiday 2023 — Double Dream Shard Research event rolls over at 4:00 a.m.
• [Important] Event bonuses apply only to sleep data tracked on Greengrass Isle.
• [Important] Once a certain amount of time has passed after the event, Snover and Abomasnow will no longer appear during sleep research on Greengrass Isle.
• Event bonuses apply only to sleep tracking that begins within the event period.
• If you wait to report sleep data tracked before the event begins, and select “Review Later” during the event, event bonuses will not be applied.
• If you wait to report sleep data tracked during the event, and select “Review Later” after the event has ended, event bonuses will be applied.
• Event bonuses do not apply to sleep tracking during the tutorial.
• The Pikachu wearing red hats will stop appearing during regular sleep research after the event has ended, but they will appear if you use Pikachu (Holiday) Incense. They may also appear again in another event some time.
• The Pikachu wearing red hats cannot be evolved.
• After the event ends, you won’t be able to use the Candy Boost function. If the Candy Boost function is unlocked again in another event, the amount of EXP gained and/or the Dream Shard consumption may change.

Source: https://www.pokemonsleep.net/en/news/4270/