Barba is the giant bearded colossi that Mel had to face. He is one of Yveltal's older creations, posed to guard the ruined arena in the hidden lands. He had been around much longer than the other colossi, and he actually made the arena himself. He maybe the oldest of the colossi but he's not the wisest, often thinking that force can handle anything and everything mainly because most enemies that meet him appear like annoying bugs.
He first appears from his "release room" to confront Mel and Yamato. He kept on chasing the two dogs for a while, crushing the small walls along the way. For most of the fight it was mainly chase. When they got to the end of the arena, Barba began fighting, usually just trying to stomp them like bugs. But as the fight went on he was attacked by the two, Yamato biting in his shoulder as Mel was biting in his head. The giant bearded colossi managed to throw them both back to the entrance just before his injuries finished him off, losing his chakra orb to the two dogs.