This data pack supplies the drops and the advancements, but not the badge images. The pictures come from the Cobblemon Pokémon Badges mod. If that mod is missing, badges and advancement icons won't display properly.
Signs Something Is Missing
- Badge items show the purple-and-black checkerboard texture.
- Advancement icons for badges look blank or broken.
- Gym Trainers don't drop badges at all. This can mean the data pack itself isn't active.
Step-by-Step Check
1. Confirm the required mods are loaded. You need Radical Cobblemon Trainers (for the Gym Trainers) and Cobblemon Pokémon Badges (for the images). Open the Mods list from the title screen, if your loader has one, and look for both.
2. Confirm the data pack is enabled. Data packs live in your world's datapacks folder. In game, run /datapack list to see enabled packs and check that this one appears.
3. Reload after changes. If you added or changed the data pack while in the world, run /reload. Then beat a Gym Trainer again to test.
4. Restart after adding mods. Mods only load on startup, so close and relaunch the game after installing a missing one.
5. Multiplayer note. The data pack must be enabled on the server's world. Each player also needs the mods that provide the textures so the badges display correctly on their screen.