What's Dr Manhattan's Powers?

He does not need air, water, food, or sleep, and is immortal. He can teleport himself and others over limitless distances. He is also capable of true flight, although he uses only levitation in most of his appearances. Due to his perception of time, he sees his past, present, and future simultaneously.

Is Dr. Manhattan the most powerful superhero?

Manhattan is not only the most powerful comic book character, but the most powerful fictional character ever created.

What is Doctor Manhattan's weakness?

Tachyon beams are essentially Doctor Manhattan's greatest weakness. Adrian traps him in a tachyon field when the heroes come to Antarctica, and tachyon beams are also what Ozymandias uses to hide his plans from Jon until the very end.