From time to time, The Pokémon Company and Nintendo will distribute a variety of QR Codes for special people in the franchise. If you scan these codes, it unlocks a special Secret Base which is not in any of the usual locations.

In Mossdeep City, there is an oldman who stands by his door in his house hoping for a special Secret Base to appear. If you scan a special QR Code, the new Secret Base will appear on the other side of the door. Everything else about these bases is conventional, with the ability to battle all the characters within and to take their flag to add to your flag count. They are all Gold Rank with 500 flags logged. You can also only receive one gift a day from them and obtain one flag a day.