Today's update tells us what Pit's Final Smash is. It's called Palutena's Army. You see, Pit is the captain of Palutena's Army, the guardians of Palutena. Who is Palutena? She's the Goddess of Light and when Pit calls to her in the heavens, she will appear.
The Goddess Palutena then calls forth her army, an army of flying Centurions. They come and dive down at incredible speed. It's very difficult to dodge one of them. Each Centurion attacks ones and falls in battle.