If you want hostile mobs to naturally spawn you need to go into the configs and go to pixelmon then entity. From there change "allow-vanilla-mobs" from false to true.
This data pack allows vanilla mobs to spawn alongside Pokemon from the Pixelmon mod.
For Minecraft versions 1.20.1 and 1.21.1.
In the most recent update for 1.21.1 you can spawn all mobs except Giants. These have been used to replace other mob spawn replacements.
This datapack requires the Pixelmon mod to have an effect.
Simply drop this pack into your world's datapack folder to install.
If you find any bugs feel free to leave a comment.
Feel free to use this in modpacks.
