Ensure the game cartridge is clean and free from damage. Softly blow into the cartridge slot and reinsert the game cartridge to make sure it's properly seated.
- Delete and Re-Download the Game:
Some freezing issues can occur due to glitches in the game data. Try deleting and re-downloading Pokémon Diamond from the Nintendo eShop. Make sure to back up your save data before doing so.
- Update Your System:
Install any available system updates for your Nintendo 3DS. System updates can sometimes fix compatibility issues with games.
- Try a Different 3DS:
If you have access to another Nintendo 3DS system, try playing Pokémon Diamond on that console to see if the freezing issue persists. This will help determine if the problem is with your specific console or the game cartridge itself.
- Contact Nintendo Support:
If the issue persists despite trying all of the above, contact Nintendo Support for further assistance. They may be able to provide additional troubleshooting steps or arrange for a repair/replacement if necessary.