U-turn Aerodactyl seems cool, it gets all the momentum it needs, fast u-turners are usually very good, and RU doesn't have enough of them being faster than flygon really helps turn aerodactyl into some sort of pivot, even though it's quite frail, and U-turn almost makes it not wanna run LO, I would like to see how it plays out, with a bulkier set perhaps OR just good ol' CB :] (it should also get brave bird head smash and rock head)
Prankster Gourgueist seems amazing, you can finally have the bulk of the large form with the speedy annoyance of the small one, and I love sub seed gueist... Frisk is also probably my favourite ability, but prankster would just improve this mon a lot