This is not a single QR code but a combination of a code.bin file and a QR activator. You download the "Scarlet/Violet Patch" via Universal Updater, then scan a companion QR to randomize those spawns.
: This method is generally inconsistent on "New" 3DS models and is best suited for original 3DS/2DS hardware. 2. Installing Randomized CIAs (Modern Method) pokemon y randomizer qr code better
“You scanned the code.”
Standard randomizers often increase shiny odds to 1/100. That gets boring fast. The better approach is the "Reverse Shiny" code. This makes Trainer Pokemon shiny more often (1/250) while keeping wild Pokemon standard. It adds visual flair to battles without breaking the economy of the game. This is not a single QR code but a combination of a code
If you want "better" meaning complete control over abilities, evolutions, and trade evolutions, you still need a ROM patch. But for 99% of players wanting a fresh run of Kalos, a properly generated QR code is the answer. The better approach is the "Reverse Shiny" code