Not sure about the pixelmon specific plugins, however:
- WorldEdit - Look for WorldEdit for Forge (it is a mod, but compatible with Sponge… https://minecraft.curseforge.com/projects/worldedit)
- World Guard - There are a few world protection plugins: FoxGuard ([API 6.x/7.x] FoxGuard - The flexible world protection solution) and Grief Prevention (blood / GriefPrevention)
- PermissionsEx doesnt work, use LuckPerms instead (Luck / LuckPerms)
Good Luck!