Formless

Time has closed the door on Formless. The developers say it is permanently unobtainable and will not return. It was won through the Season Pass spins: first you had to hit the special item slot at 1%, then pass a 5% roll for the zone, which the wiki puts at 1 in 2,000, or 0.05%.

Originally the shot was almost instant, with full aim assist. A later change slowed it to normal speed, but you still pumpfake and change direction freely, and the full aim assist remains for no-look shots, now only inside the 2-point area.

The name and description point to Aomine's formless shot, which is the reference for Ace, the style it was made for. Ace is a Mythic Shooting Guard billed as nearly impossible to guard one-on-one, with Athletic Drive and Instinct Dash. The wiki recommends Ace and other offensive styles with strong dribbling. Its reasoning is that once the zone is on, defenders have to predict your shot instead of reacting to it, and mixing in dribbling makes the prediction harder.