Oddly enough, I had no idea there was even a shiny Ariados in the Dawn special. Whether I was just too tired or too bored to notice... or if it was because there were just a lot of them. Either way, that really shows how much the Dawn special didn't reach out to me; totally missing a shiny appearance is just sad both on my part and this episode's.
I think what I paid attention to the most was Dawn and the annoying bratkid celebrating as Quilava burned dozens upon dozens of Ariados to a crisp. Okay, they weren't graphic about it of course, but something just seemed off about that scene. XD Given that this is like the fourth time or so this has happened with Dawn, though, she must really friggin' hate the Ariados species by now.
I agree with the user who said she should've caught one to make it full-circle. If only they could be that deep... though sometimes they can be. I'll just chalk it up to the crap writer Musashi namedropped.