Tim's Ultimately Comprehensive Cobblemon Edits of Destiny

Cobblemon's spawn rules for some species use block tags to check for water or lava nearby, and Cobblemon does not yet support that check. This mod works around it by pointing the affected spawns at the actual water, flowing water, lava and flowing lava blocks. The affected species include Squirtle, Psyduck, Slowpoke, Magmar, Vaporeon, Dragonite, Wooper, Slugma, Froakie, Goomy, Salandit, Sobble, Quaxly and several others from the water, lava and swamp groups.

The mod is written as a data pack and resource pack addon, so it changes spawn data without altering Cobblemon's code. It also fixes three specific problems: Nero Whiscash did not appear when fishing with a Masterball Poke Rod, Hisuian Goomy did not evolve into Hisuian Sliggoo in the overworld, and Heart Wooper did not spawn from fishing with a Love Ball because its aspect was invalid. The author notes that the patches let fixes ship here before the next Cobblemon release.

Installation needs Cobblemon. The mod is published for Fabric and NeoForge, with files for 1.21.1, and it is also offered as a data pack. The code is under the MIT License and the project is not open source. Players can join a server that runs it without installing it, because the environment is server required and client optional.