I think Mewtwo can have Focus Blast so you might be onto something here with Gengar.
A three man group I know just successfully completed a Zapdos raid with 5 seconds left. Nice challenge!I have kinda learned to hold my tongue on this isuee, but there's virtually no practical difference between a 75% IV Pokemon and a 100% IV perfect Pokemon. I wouldn't get too hung up on catching perfect ones. As long as they are 80%+ and have max Attack, they're pretty much the best they're going to be.