Versatile Mage: All My Undead Are Pokemon

Ye Yuan transmigrated into the world of Versatile Mage and encountered the Bo City Crimson Alert incident from the start! At a moment of extreme danger, the "Battle Order System" successfully bound itself to him, and Ye Yuan awakened the Undead Element. Yet the first undead he contracted was actually, Gastly! Not only that, the System also told him that the undead contracted through his Undead Element magic could only be Ghost-type Pokemon? In that case, Ye Yuan would simply take his Ghost-type Pokemon and roam the world of Versatile Mage, letting the demons here witness the might of undead from another world! Silver Sky Lord, can you withstand a Shadow Ball from my Mega Gengar? Corpse of the Mountain Peak, take this Z-Move from my Mega Golurk! Sea Demon Emperor, can you withstand Mega Froslass's Absolute Zero?!