Apparently there are codes that can make a Pokemon shiny after capture, when you mark it in a PC, like the one the OP showed us.
Other variations of these codes including marking to change EVs, Marking to change nature, and Marking to change ability.
Most people who ask for AR codes, tend to
1. want to experience the stuff in-game (let's say ask for a shiny code, cause want to see wild sparkles)
2. don't have access to save dumping, hence can't use PKHeX
That being said, there are ways for the OP to get Pokemon without save editing.
For the OP, I'll say use some kind of present day FakeGTS/GTSspoofing to connect and dump the Pokemon
I can't say for sure, but Pokemon Class Network (link here) might actually work for you.
Anyhow, going back to your actual request:
I took a version of the shiny code, and made a non-shiny version, but since I have absolutely no idea how the original code works,
what I can say is:
1. It works (somehow)
2. No idea if there's any side-effects
3. Use at your own risk
4. Based on my test on an emulator, code has to be off, else the game won't launch (likely same as original code)
5. Only mark a Pokemon in PC, not party (likely same as original code)
Code inside:
The logic behind me changing that 0 to 1:
I assumed how the original code was meant to work, was to grab your Pokemon's TID/SID, then try to generate a shiny PID based on that.
So if I can screw up the TID/SID/PID xor process, it'll actually give you a non-shiny PID (which it did, lol)
Using this code on a Pokemon that was caught on games pre-Gen V might turn them illegal,
due to the fact that it screws up PID-IV-Nature correlations.
Sorry for the wall of text; I had to reply everyone ;P