From Final Fantasy Wiki

Cagnazzo being summoned

Cagnazzo (カイナッツォ Kainattso) is a summon in Dissidia Final Fantasy. He can only be summoned as a counter to an opponent's summon and fixes the opponent's Brave when called. His original artwork from Final Fantasy IV is used in this game. Cagnazzo can be obtained on the second stage of the Shade Impulse II storyline.

Trivia

• The lines Cagnazzo delivers when you obtain his manual form in Shade Impulse II is taken almost directly from his lines just after his death in Final Fantasy IV, except directed at whoever the summoner's enemies would be.
• Like the other Archfiends, Cagnazzo appears to serve as a "counter" version of one of Final Fantasy I's Four Fiends, who work on a timer. Specifically, Cagnazzo's Deluge works like Marilith's Flame Arcana; both freeze the opponent's Brave. Both Cagnazzo and Marilith are the second "Fiend" encountered in their respective game (although it is possible to postpone the encounter with Marilith in Final Fantasy I, it is not the intended course of action).