Actually, SO, I've seen people do bench and squats with bands pulling the bar upwards, as a way of engraining good form on the decent of those two lifts. But I'd say if there's an opposing movement to squats it would be effectively the GHR or reverse hypers.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)