This attack is acquired by specializing in Fighting skills. Liza is the best as she can get this developed the quickest, but others will work… just be prepared for a long wait (Fei-on took me 23 hours of work to get all the skills)

Sliding
Suplex
Babel Crumble
Giant Swing

Equip all four on a single character and the DSC option will appear in your attack menu. Warning! This takes 18 WP, so save it for bosses or if you're just experience building.