Playing ROMs requires an emulator. Depending on your device, expert communities like those at r/pokemonplatinum recommend:

To get the most out of a Pokémon Platinum 4997 file, ensure your setup matches these standards:

: Use moves like Surf or Waterfall directly from the overworld if you have the HM in your bag, without needing to teach them to a Pokémon. Visual Enhancements

If you have the 4997 Rev 1 ROM, these are the top-rated community projects you can apply as a patch: