Activating During World Creation
Before generating a new survival or creative world, ensure the Cobblemon: Ride On! mod is loaded in your game, as this data pack requires it to function properly. On the Create New World screen, open the More tab and click Data Packs. Select Open Pack Folder, place the Cobblemon Ride on Expansion Data Pack archive into that folder, and return to Minecraft. Click the arrow on the pack's icon to move it from Available to Selected, then click Done before creating the world.
Enabling in an Existing World or Server
Unlike mods, data packs apply per world save rather than globally. To add the expansion to an existing singleplayer save, select your world in the Singleplayer menu, click Edit, and click Open World Folder. Open the datapacks folder inside and place the pack there. On a multiplayer server, open your active world directory and place the pack inside its datapacks subfolder. Load the world (or start the server) and run /reload with operator permissions so the new mounts, speed stats, and seating positions activate immediately.