Denying npc spawn within a certain area

I have pixelmon on my server and i’d like to deny npc spawns within the spawn area. I have red protect and world edit. Is there a method of doing so with those plugins? If not can someone link me a plugin that will deny npc spawns.

Try grief prevention, I think there is support for specific entities from different mods using /cf entity-spawn Pixelmon:mobname false. Check the wiki though. If you need help join the discord everyone is very helpful. There is a Pixelmon section on the wiki too.