An air shot is a battle technique referring to the instance when a weapon is fired from the air, as opposed to the ground. All weapons have air shots, but only some are different from the ground shot. The most common instances involve guns, but some bombs and pods have unique abilities as well. Before committing a weapon to use in serious battle, you should practice with it and familiarize yourself with the air shots of all your weapons.
in custom robo arena, you can use a gun's air shot on the ground by pressing a & b at the same time. this is very effective when using guns such as the gravity gun, to make low 'gravity prisons'.