If you cannot obtain a clean ROM and just want to play the game, you can disable DSi mode in your emulator or flashcart settings. For example, in melonDS:
Note: This does not work for DSi-exclusive games (titles that never had a standard DS release). Those absolutely require a clean ROM with DSi binaries. The Dsi Binaries Are Missing Please Obtain A Clean Rom
Some ROMs are mislabeled as DSi-only when they aren’t. Try: If you cannot obtain a clean ROM and
Use the Memory Pit exploit (free, no flashcart needed): Note: This does not work for DSi-exclusive games