So, I've been playing the demo recently and I even went out of my way to catch chain myself a Shiny Rattata earlier this morning, which was pretty cool. I haven't seen any sort of documentation or posts of people saying they've gotten a shiny in the demo, so I might have the first shiny ever obtained in the demo!
However, I've been wondering, since the encounters in the demo for Viridian Forest are rare encounters? I already know Bulbasaur's one of them, I did see a few during my chain. Are there any other known ones?