I know, not everyone has it, but this thread might be a good idea anyway. Why do I say that? Well my 18th Pokémon in Quest was a Shiny Shellder. THis is the fastest I've found a shiny after getting a new Pokémon game.
I don't have the game yet, but I'm watching TheJWittz stream it on Twitch, and he just got a shiny Jynx.
How rare are shinies in this game anyways because it doesn't seem that rare (like its easier then Community Day PoGo Shinies from what I've been hearing)
My first ever shiny was a Rhyhorn that I immediately evolved into a golden Rhydon. He's a part of my main party for now since the next few areas I'm in have bonuses for rock and ground types.
I have to wait for the game to come out on mobile, but it seems like shinies aren't too rare in this game.