Currently missing following that logic is aluminum, platinum and silver nuggets.
Why? For one, consistent gameplay logic is always great and having nuggets be added to drops or be used in custom content is a nice addition.
Edit: Vanilla tools (excluding Netherite) can also be smelted down for nuggets, while it tends to be a meager amount it does gel with gameplay. Some mods do take advantage of this structure and are able to recognize it for their own recipes. While this has no major impact on Pixelmon it could help with compatibility.
Another that could benefit from this structure is evolution stones. While amethyst, crystals, rubies, sapphires and silicon currently have blocks, the evolution stones do not. It could benefit the mod. Be it for decorative purposes, storage reasons or for powering beacons.
Thank you for reading this suggestion!