Dedenne will be added to Pokémon Sleep starting on March 11th, 2024 and will appear in the Greengrass Isle and Lapis Lakeside.

New Arrival: Dedenne

It seems that Dedenne has been spotted on Green Grass Isle and near Lapis Lakeside—maybe this is thanks to the sleep research you’ve all been conducting! It may be possible to encounter it during sleep research soon.

Also, Dedenne’s main skill, Tasty Chance S, is a new main skill that makes your cooking more likely to come out Extra Tasty! We hope you’re looking forward to this!

Dedenne Details

Appearing Beginning: 3:00 p.m. on March 11, 2024
Appearing at: Greengrass Isle, Lapis Lakeside
Sleep Type: Dedenne: Snoozing
Main Skill: Tasty Chance S (New Main Skill)

• Cooking will be more likely to produce an Extra Tasty dish.
• The effects of Tasty Chance S can stack up to a maximum of 70%.
• The effects of Tasty Chance S will be reset when the user moves to a new site or when an Extra Tasty dish is made.
• The current likelihood of making an Extra Tasty dish will be displayed on the Cooking screen.

Source: https://www.pokemonsleep.net/en/news/5046/