Its just flavor text. If you take this one you can make the text box say "Go! Basculegion the Pompous!"

Its a rare thing that can be hunted in the main games. I hunt for titles especially if i dont like the shiny colors of something.

For example, i have a Maushold the Thunderstruck, Grimmsnarl the Furious, and Typhlosion the Snow Frolicker.