None of these can be modified directly using RPG Maker XP, and were thus left out of the previous tutorial. Things such as adding Pokémon, creating Trainers, making items, to name a few.
You probably noticed that in the previous tutorial, we mentioned nothing about several features in fangame creation which are seemingly essential. Fangame Tutorials: Editor.exe and Metadata Editing.A guide to beginning Pokémon fangame development in RMXP.