Wondershy

It’s a well known fact that Fluttershy is a weak flyer. The Wonderbolts believe this as well. Rainbow Dash knows better.

Fluttershy's skills in flying are sketchy at best, but when Spitfire and Soarin chance by a monster attack in town, it is apparent that the timid little mare has been hiding some impressive talent, skills good enough to warrant recruitment into the Wonderbolts. There's just the issue of the house-eating monster between them and her.