To Celebrate the Year of the Snake in 2025, the Mass Outbreaks of Snakelike Pokémon event will take place from Friday, January 10th, 2025 to Sunday, January 12th, 2025, at 23:59 UTC.

Prepare for Mass Outbreaks of Snakelike Pokémon!

Pokémon Slither in to Celebrate the Year of the Snake! Get ready to celebrate the Year of the Snake in 2025! From Friday, January 10, 2025, at 00:00 UTC to Sunday, January 12, 2025, at 23:59 UTC, mass outbreaks of Silicobra will be appearing throughout the Paldea region, mass outbreaks of Ekans will be appearing throughout the land of Kitakami, and mass outbreaks of Seviper will be appearing throughout the Terarium at Blueberry Academy.

Shiny Pokémon are more likely to appear in these special mass outbreaks, so don’t miss out on your opportunity to nab these Pokémon before they ssslither away!

Event Schedule

Friday, January 10, 2025, at 00:00 UTC to Sunday, January 12, 2025, at 23:59 UTC

Locations and Featured Pokémon

Paldea: Silicobra
Kitakami: Ekans
Blueberry Academy: Seviper

What Is a Mass Outbreak?

Mass outbreaks are a phenomenon in which many of the same species of Pokémon appear in one location. During limited-time mass outbreak events, certain Pokémon will become more likely to appear.

Information about Mass Outbreak Events

• In order to participate in limited-time mass outbreak events, you need to have downloaded the latest update data and the latest Poké Portal News. You do not need a paid Nintendo Switch Online membership to receive the latest Poké Portal News.
• You can download the latest Poké Portal News by selecting Poké Portal from the X menu, then Mystery Gift, then Check Poké Portal News.

Source: https://sv-news.pokemon.co.jp/en/page/301.html