Palutena detonates an explosion directly beneath her and announces "Rocket Jump!" as she is propelled upwards. The explosion deals 12% on the ground and 10% while airborne, and can Meteor Smash opponents directly beneath her.
Rocket Jump is Palutena's most offensive Up Special Move, being capable of KO'ing around 120%. It is a useful method of escaping pressure on the ground and relieving pressure underneath Palutena. However, Rocket Jump grants Palutena the least recovery distance out of all her other Up Special Moves, and it leaves her vulnerable to attacks from above.
Rocket Jump is one of the many Powers originating in Kid Icarus: Uprising, but was actually just an explosive version of another power called Sky Jump. The explosion itself isn't very strong, but Pt can attack while he is airborne, and goes a great distance when dashing.