Final Fantasy XI featured special super abilities players could only use every two hours. Absolute Virtue could use all of them, repeatedly, was immune to everything, had 100,000 hit points, and auto-healed faster than Wolverine. That's not a boss; that's the Pokémon your little brother designs on the back of his schoolbooks.
It won't take more than a single Pokémon to delete them.
"It's impossible for you to kill me."
— Nohman, Zone of the Enders