Adding New Pets
Pets - Petbedge_interface.lua - This file needs to be edited both client and server (separately as it has specifics exclusive to both server and client side). Clone a pet in Seledit or Rody's Angelica Editor (much easier in this editor, but it's subscription based).
We'll be using Pandapocalypse (Item ID: 34460) as an example for cloning. Basically we're going to copy everything with the ID 34460 for a new ID.
Pet speech:
This location is the actual pet stats: