Cobblemon Mass Outbreaks
by Scouter567
Players who run Cobblemon on a server can trigger Mass Outbreaks with Cobblemon Mass Outbreaks, an addon that spawns swarms of Pokémon around the player.
What it does
When a Mass Outbreak starts, groups of Pokémon appear near the player instead of at fixed spawn points. Four individuals of the same species show up first, and new ones keep appearing as the player defeats or catches them, until the swarm is cleared. Each outbreak produces roughly 10 to 15 Pokémon, and shiny variants are more likely to turn up among them.
The addon requires Cobblemon, and the server must run it while players may join without it. Builds exist for Fabric, Forge and NeoForge across 1.19.2, 1.20, 1.20.1 and 1.21.1, and the source code is published under the MIT License. New outbreaks are defined in the outbreaks file, which server owners can extend.
Key features
Roaming outbreaks
Swarms appear wherever the player happens to be, not only at predefined map locations.
Same-species swarms
Each outbreak starts with four Pokémon of one species, and more of that species appear as they are dealt with.
Enhanced shiny chance
Shiny variants are more likely to appear during a Mass Outbreak than in regular encounters.
Extendable outbreak list
New outbreaks are added through the outbreaks file, so the set of species can be changed without code.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Server hunts
Server owners can use outbreaks as a repeating activity in multiplayer worlds running Cobblemon.
Who it’s for: Server owners who run Cobblemon and want additional encounters during play, and players who join such servers.
How it compares
No Outbreaks is a Fabric and NeoForge mod for 1.20.2 – 1.21.1 that must run on both client and server, and it is open source under the MIT License. Legends & Myths (Cobblemon) is server required with an optional client, for 1.20.1 – 1.21.1, under a Creative Commons Attribution Non Commercial 4.0 license that is not open source. Cobblemon Mass Outbreaks is server-side only and open source under the MIT License.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Cobblemon Mass Outbreaks | Fabric, Forge and NeoForge | 1.19.2 – 1.21.1 | Server-side only | 2025-07-02 |
| No Outbreaks | Fabric and NeoForge | 1.20.2 – 1.21.1 | Client and server | 2024-09-27 |
| Legends & Myths (Cobblemon) | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Server required, client optional | 2025-11-23 |
Questions
Does Cobblemon Mass Outbreaks require Cobblemon?
Do players need to install Cobblemon Mass Outbreaks?
Which loader should a server use?
In the catalog
Cobblemon Mass Outbreaks is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 32,366 mods support Minecraft 1.21.1.
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What the author says
The "Cobblemon Outbreaks" mod is a Cobblemon addon that introduces Mass Outbreaks similar to those in Legends Arceus. In this mod, the outbreaks spawn around the player rather than being limited to specific locations. When a Mass Outbreak is triggered, swarms of Pokémon spawn near the outbreak, with four of the same…
Official listing
- Modrinth page
- modrinth.com/mod/cobblemon-mass-outbreaks
- Owner
- Scouter567
- Published
- 2023-11-23
- Updated on Modrinth
- 2025-07-02
- Facts verified
- 2026-10-15