Evulz wants to bring about world peace by uniting all of the world's nations under one government.
Alternatively, Evulz loves commanding his Mooks and rallying his Empire, and wants to rule more than just an army.
Inverted: Evulz is seeking an heir to his global empire and, as soon as he finds one, he will give up his throne.
Evulz claims he wants to rule the world but this is a lie to inspire his Mooks.
Evulz does want to rule the world but he's not actually doing it for villainous purposes or through villainous methods. His ultimate goal is to unite all the world's peoples into an empire of peace and prosperity.
Evulz attempts to take over the world and finds out it's already been taken over by Bob.
Zig Zagged: Evulz lies to his Mooks about wanting to rule the world, but the lie part is they're not getting any of it; he's going to rule alone. The Hero tells him how much responsibility this would be, at which point Evulz offers to split the workload. Evulz has no idea what to do when The Hero says no.
Averted: Evulz has no desire to rule anything, except maybe his Mooks.
Enforced: "We need a motivation for this villain that's both ambitious and dangerous. Let's have him try to rule the world!"
Lampshaded: "I'll rule the world! Because everybody else is doing it!"
Invoked: "Maybe this idiot will listen to me when I am ruler of the entire world!"
The world already has a ruler, and he is much more powerful than Evulz.
Evulz deconstructs and scoffs at the prospect of taking over the world.
Discussed: "You know, I bet this guy wants to rule the world." "Why, because he's evil? Not all evil people want to take over the world. Some want to destroy it."
Conversed: "Have you ever noticed how many villains just want to rule the world?"
Alternatively, Evulz sets out to take over the world, but is almost immediately slowed down by having to fight back all the military forces in the world. He later quits after running out of money and is swiftly arrested.
Reconstructed: Emperor Evulz enlists the help of his dragon when he needs a break.