Sorry, my mind's stuck in a Mienfoo state. Let's say...let's say a Water Pokemon, since a lot of them can learn Bounce, uses Hydro Pump at a downrads angle to propel itself into the air. Would that be more feasible?If you mean using a physical attack as the mon is coming down, that sounds like it should work.
Rocketjumpingusing a projectile attack when going up sounds less likely, especially with something like Aura Sphere, which doesn't have that much launch power IMO.
Stupid me worded is "projectile" when I really meant "beam"