I’m watching Dallas stream and someone just superchatted that there is a glitch that increased shiny odds in BW, and I’d like to know the details.
They say it makes the odds 1/1000.
Is this real?
There isn't a documented glitch that changes your shiny odds. If something so major existed, it would have a section on Bulbapedia's Gen V list of glitches.
Hope I helped!