Ultimate Monsters were a special race of magical treasures that possessed extraordinary strength and abilities. They are usually very powerful creatures that can fight Pokémon Masters. There were many types of ultimate ultra beasts, including heavenly origin beasts, dragon god ultra beasts, tyrannosaurus beasts, fire dinosaurs, water lord beasts, grass king ultra beasts, insect king ultra beasts, lightning king ultra beasts, steel king ultra beasts, ice king ultra beasts, giant gold monsters, super dream beasts, and so on.
The Ultimate Beast is one of the most powerful creatures in the world of Pokémon. It has extraordinary strength and ability to easily destroy other Pokémon. In battle, ultimate beasts would usually choose to fight with magical treasures of the same species as them because they had a special connection and resonance. However, due to their great strength and ability, even Pokémon Masters would need to expend a lot of strength to defeat them.
Well, it could be about Gohan and Naruto teaming up to fight a common powerful enemy. Maybe an evil force from another dimension is threatening both their worlds, and they have to combine their unique powers and skills to save the day.
It could be a powerful demon that has the ability to absorb the powers of others. This demon has been observing both Gohan and Naruto from the shadows and wants to take their powers to become invincible.
In a crossover with the DC Universe, Darkseid would be a great antagonist. His immense power and his desire for universal domination would put him at odds with Ultimate Gohan who stands for justice and protecting the innocent.
Perhaps Ultimate Gohan could cross over into the world of Star Wars. He could use his powers to assist the Jedi in their fight against the Sith. His ki blasts could be like a new form of Force power in that universe.