What is the name of the anime with characters that uses some type of gem to power up with armor?

What is the name of the anime movie with characters that uses some type of gems to power up and get armor that would help them fly, they would spar allot but at the end they teamed up to fight a boss who was a giant that had a gold mask with red eyes and looked like a Greek God, they defeated him and the boss transformed into his true state and had a yin yang mask?