Just finished the Charizard event on the first try with rando's. They give you a rediculous amount of time and it's not really that bulky to begin with. I've had waaaay harder 5* raids. It seems to have perfect stats and nature right out the gate though, mine came Modest 6IV-31, curious if it's the same for every capture. Can't test it myself because you can only catch one (it's breedable though).
Can confirm the item dupe is now patched (apparently you can still if you have a cloned Don, but they can't be taken out of the party at all anymore), haven't heard if the RNG seed was fixed yet (I don't have a team yet so I can't test it), and some people are claiming the game is performing better (I'm not noticing any difference). That seems to be it for the patch.