Skull Emperor XXL

"Yikes! It's the Skull Emperor XXL! It's a nightmare that we're about to face! That must've been much worse than PETAI and Mega Probe combined! Boboiboy won't be that happy about this! Now I need to do something so I can defeat the Belkan Grey Men once and for all... starting off with destroying the Skull Emperor XXL."

--Su Ji-Hoon, Doing Their Best

The Skull Emperor XXL is the most ultimate battle robot in during World War III that he was damaged former PETAI robot has been turned into the most ultimate battle robot by the Belkan Grey Men putted a Skull Heart into inside of his chest for revivial, same as a dead Probe being revived and become his new upgraded form.

He is very strong at his defensive and his magicial power due to having power from the Skull Heart that he is stronger than Skullgirl Marie Korbel and other PETAIs. His color skin would be based on the color skin of the Skull Heart. He lost his rocket launcher,his flying boosters and his laser beam due to both of his three weapons has been destroyed,which make him being damaged before being revived and turned into his new upgraded form but he is very well at melee attack, using magics and having a Stand, The Belkov Heart after being revived and turned into his new upgraded form.

Also,he would have his new voice and his emotion,which he would have his own intelligence and can speak

After the Belkan Grey Men added robot wings on his back, he would be deployed in during Battle of Canopolis after Global Liberation Union's SOLGs and SOLG Canopolis Destroyer have been destroyed, which he would be final boss of Battle of Canopolis when the heroes faced against him in land ground after using aircrafts.