Galamton

Galamton is the final boss of Project X Zone 3: Sacred Destinies, he is a demon who has a rivality with Arisu Clan.

Crosspedia Entry
A Demon who was the responsible of a disaster caused 10 billions years ago similar to Ouma and Oros Phlox's ones, the Arisu Clan of that time takes control of the situation, one of them discovers the Arisu Clan's Forbidden Art and sent him to fall asleep forever, however the one who makes the Forbidden Art dies after make it.

But his sleeping state ends later in the present timeline when Sofia wakes up him as part of her betrayal against Ouma Japan and Ouma U.S.A.

His body is a humanoid-like form with an scenario replacing a skin, he has two forms: "Sleep" where his skin shows the space and has no face, the "Awaken" form is where he reveals his true himself, the space skin is changed to the hell and his face is shown

Super powerful, an incredible wrath, the previous enemies Meden Traore and Byaku Shin has no chance to beat him even if they teams up to kill him.

Trivia

 * His appearance is based on Tabuu from Super Smash Bros. Brawl.