Place this datapack in your Pixelmon's file for disable mob replacement
Tuto :
Open your Pixelmon's file with Winrar or 7zip
Open the file with Winrar or 7zip and place in "saves", your save's world and "datapacks" in Pixelmon's file
Or "world" and "datapacks" on server
For Pixelmon's 9.2.0 to 9.2.10 on Minecraft 1.20.1 or 1.20.2