Basic Datapack to help enable Vanilla Mob Spawn in Pixelmon 9.3.6
Additional Information:
Download this datapack, unzip it, and copy the entire disable_spawn_replacement_datapack_9.3.6 folder into your Datapack folder inside your world save folder. You will need to run the world at least once to generate this folder. If you are using CurseForge, just click on the 3 dots next to play and choose "Open Folder."
Then navigate to "save" and find your world folder. The datapack folder will be inside there.
To Enable Vanilla mob spawning, you will also need to adjust a config. For Neforge specifically (not sure about other modloaders if this is different), this config is found in your Modpack directory, under the 'Config/Pixelmon', you are looking for "entity.cfg"
Inside this file, change the line: allow-vanilla-mobs: false to "true"
Then load the game! If you have any issues, you can comment here or hit me up on the "Pixelmon" official Discord server, as GGrNoob.
Enjoy!