Are you planning to play this on a or are you setting it up on an emulator ?
You must use a "Batch 3DS Decryptor" tool. This process rewrites the file into a "Decrypted" state, which allows emulators to read the game data directly without needing external keys.
If you prefer to keep the file as is, you must find and place the aes_keys.txt file into your emulator’s system folder. This allows the software to "unlock" the game on the fly. Why Choose the USA Version?
Pokémon Omega Ruby is a demanding title for hardware. Whether your file is encrypted or decrypted, ensure your device supports or higher to avoid graphical glitches during the game's cinematic Mega Evolution sequences.