Dragon Force: Rise of Ultraman.

The crisis of Genesis Crystal is imminent, and Evan begins the crazy countdown to ruin the world. Ultraman needs to maximize his abilities in order to stop the Earth from being destroyed. He choses [sic] a little boy as his representative in the world and vanishes soon, leaving a magic cube to encourage him and hope it will help motivate his strong power. Everyone is trying every possible way to open up the magic cube. Dr. J even finds that tge little boy's fart is the key to set up a series of laugh-out "fart-induced" experiments to try to figure out the secret.