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Pokémon Legends Arceus guide: Massive Mass Outbreaks

Many swarms of Pokémon are appearing around Hisui

A map showing hidden Massive Mass Outbreak targets Image: Game Freak/Nintendo via Polygon
Julia Lee (she/her) is a guides producer, writing guides for games like The Legend of Zelda: Tears of the Kingdom and Genshin Impact. She helped launch the Rift Herald in 2016.

A free update for Pokémon Legends: Arceus has added a new gameplay element: Massive Mass Outbreaks. Just like Mass Outbreaks, these cause swarms of Pokémon to appear in certain areas, but as the name implies, they invade at a larger scale. Our Pokémon Legends: Arceus Massive Mass Outbreak guide details how to get Massive Mass Outbreaks, their Shiny rate, and how to complete them.

What are Massive Mass Outbreaks?

Massive Mass Outbreaks are when about a dozen different Mass Outbreaks are happening on a map at the same time.

As with regular Mass Outbreaks, if there’s a Massive Mass Outbreak, the gate guard in Jubilife Village will warn you.

Once you get to the area, Mai and her Munchlax will be stationed at the camps. You can feed Munchlax 5 Aguav Berries to reveal what’s at each outbreak, otherwise they’ll remain a question mark on your map until you go to the area.

The Massive Mass Outbreaks will only be around for as long as it’s storming, and once the storm ends the outbreak will end. We were able to get to 3-4 different outbreaks before the Massive Mass Outbreak ended.

How do I get Massive Mass Outbreaks in Pokémon Legends: Arceus?

Massive Mass Outbreaks are postgame content, meaning you have to have beaten the main story for the game to access them. Once you do, Mai will appear with a request, and you’ll start a quest that involves investigating the Massive Mass Outbreaks.

Once you complete all of these requests, Massive Mass Outbreaks will start appearing in all of the areas.

What do the different symbols mean?

Once you uncover the outbreaks, some of them will have symbols attached to them.

If there’s a berry on the outbreak, that means that the Pokémon in that outbreak will drop Aguav Berries.

A map of the Coronet Highlands with a Massive Mass Outbreak on it Image: Game Freak/Nintendo via Polygon

If there’s a sparkle, that means that clearing that outbreak will lead to another outbreak spawning. This additional outbreak can spawn an Alpha Pokémon outbreak or an outbreak of the evolved version of the previously featured Pokémon.

What’s the Shiny rate at Massive Mass Outbreaks?

According to, the Shiny rate at Massive Mass Outbreaks is slightly worse than the Shiny rate at normal outbreaks.

The base Shiny rate is 1 in 315.54, with the rate improving slightly if you have research completed for that Pokémon and the Shiny charm.

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