saving NPCs and their positions/chats in external json files would make the job of a server admin a lot easier.
Editing, relocating would be a lot faster etc.
And you can easily restore them if the npc system should fail or you accidently delete a npc.
Structure:
config/pixelmon/npcs/chatting/npc.json
config/pixelmon/npcs/trainers/npc.json