CobblemonClean

On a configured interval, the mod scans for wild Pokémon that nobody is using and removes the ones that qualify, so they do not pile up on a busy server over time. Cleanup can be switched on or off separately for the Overworld, the Nether, the End and other dimensions, and an administrator can start a full cleanup of a dimension at any moment. Cobblemon is required, and the mod is published only for NeoForge 1.21.1.

Several safeguards keep important Pokémon from being removed by accident. Pokémon in a battle, Pokémon owned by players, caught Pokémon, evolving Pokémon, ridden Pokémon and tethered Pokémon are exempt, and shiny or whitelisted species can be protected as well. Players receive a warning 60 seconds and 30 seconds before a cleanup, and report how many Pokémon were removed afterwards.

Both the server and every player need the mod, since it runs on client and server. The code is released under the MIT License, and the project is not open source, so only the published builds are available to read. The latest file is 1.0.0 for 1.21.1, first published and last updated on 2025-11-04.