Place this datapack in your Pixelmon's file for disable mob replacement
Tuto :
Open your Pixelmon's file with Winrar or 7zip
Open my file with Winrar or 7zip and place "data" in Pixelmon's file
For Pixelmon's 9.2.0 to 9.2.5 on Minecraft 1.20.1 or 1.20.2