So with some friends we thought on a strategy using Taunt, Paralysis/Sleep, priority moves and bringing Catch Ratio 255 pokemon into five star Ditto Max Raids. Taunt prevents non-imposter Dittos from transforming, while imposter ones can be dealt with relatively easily anyway.

Using catch ratio 255 pokemon maximizes the chance to succeed in farming Dittos when it transforms into them, but most of those pokemon have weak stats so you should train them good.

Good CR 255 pokemon for example are pokemon with access to Thunder Wave and most importantly, Taunt. Prankster Impidimp has priority with these moves, and access to Sucker Punch or even Play Rough, in case of Ditto transforming into it.
Maractus is another particularly good pokemon for this, since it has better stats, and access to sucker punch and poison jab in case of Ditto transforming into it. Just remember to not bring a Maractus with recovering moves like Giga Drain or Drain Punch.

Important: If your team relies on Thunder wave or other paralysis moves, don’t bring ground or electric types to the max raids. Inflict paralyze/sleep moves when Ditto is about to get KO’ed, because sometimes the dynamax pokes get cured.

you can see the catch ratio list here
https://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_catch_rate

So I wonder who’s on the chopping block; Dreepy or Deino? Guess I’ll hatch this last egg and find out!

I’ve been playing set since the originals.

I’ve been playing in Set mode since Gen 6, personally. And everytime I revisit an old gen I always put it on Set mode as well.