Arcbull has a spoiled personality, and demands that others cower before its immense power. It's debatable whether it's as powerful as it acts, as it can only manage to make flashy light shows in protest when being ignored.
By baring its fangs and making a scary face, it sends smaller Pokémon scurrying in terror. It is described in mythology as the Pokémon that shaped the universe with its 1,000 arms.