1. Incorrect Code: Make sure you are using the correct code for Pokémon Platinum. The code for Platinum is different from the codes for other Pokémon games.
2. Wrong Location: The 100% catch rate code may only work in certain areas of the game. Try using the code in different locations and see if it works.
3. Glitches or Bugs: Some Pokémon games may have glitches or bugs that can affect the functionality of codes. Try restarting the game or using a different save file to see if the code works.
4. Emulators: If you are playing Pokémon Platinum on an emulator, the code may not work properly. Emulators can sometimes have issues with certain codes.
5. Incompatible Version: Make sure you are using the code with the correct version of the game. Different versions of Pokémon Platinum may require different codes.
If you have tried all of these things and the code is still not working, you may need to search for a different code or try using a different method to increase your catch rate.