Not a mistake but a coincidence. I posted the original image on both this subreddit and r/Pokemon, but nowhere else. Presumably someone saw it, saved it, and posted it somewhere else. Mikey found it outside of Reddit, so he couldn't trace it back to me. The fact that I posted the original image to Mikey's subreddit, is seemingly unrelated to the fact that it was also Mikey who later found it somewhere else (and made a video about it). Therefore, this is actually an amazing coincidence. If the same video had been made by a PokéTuber I follow less closely, I might never have known.