I tried this mode for a few battles and failed miserably :D. Nothing like getting oneshot by a random trainer with Diamond storm on Opal bridge. I also found the first "quirk" with a pokemon I caught.
I don't know how this is coded internally, but I would love to see this mode extended and polished in the far future (maybe in ep. 20? ) A cool feature would be random abilities, because they can lead to awesome and pretty hilarious situations, like a Darumaka with Drizzle. But don't stress yourself about it.
In the end I just want to say thank you for giving us something to do in these times. Stay safe!