Because you are using a verified ROM, cheat codes are standardized. Use the Action Replay DS database for "Pokemon Platinum (U)."
Pro Tip: Always use cheats in a separate save file. The Distortion World flags are sensitive; walking through walls can permanently lock you out of the Giratina encounter. Pokemon Platinum Rom 4997
Over the years, many websites have hosted corrupted, trimmed, or patched versions of Pokémon Platinum. Common issues include: Because you are using a verified ROM, cheat
The 4997 dump is widely considered the "Gold Master" – a 1:1 copy of the retail cartridge, untouched and fully functional. It is the version used by speedrunners on the "Speedrun.com" leaderboards and by hardcore Randomizer Nuzlocke players. Pro Tip: Always use cheats in a separate save file
Use xBRZ or Linear Filtering to remove the pixelation on the top screen map. However, for the bottom touch screen (bag/pokedex), keep it sharp (no filter) to read text easily.