Shelgon was first seen when a Bagon evolved in Let Bagons Be Bagons!.
Drake used a Shelgon in Vanity Affair, where it defeated Pikachu.
A Shelgon competed in the Hoenn Grand Festival in Hi Ho Silver Wind! and Deceit and Assist.
Shelgon is supposedly longing to evolve into Salamence, from which time on it can fly (a long time dream that their younger brothers Bagon share).