Originally Posted by
Selastan
If given prep-time, I'm sure Batman would figure out that Vegeta's strength comes from Ki, and then figure out how to harness it. The guy mastered every martial art on Earth. If he had the chance to observe Vegeta, he would copy his martial art style and learn how to use Ki himself. Might be a good fight, worthy of fanfic status at least. A couple of buildup chapters where Batman builds spybots to observe Vegeta's training with Whis, figures out Ultra Instinct because he is a genius, maybe even figures out the science of Ki and develops some Ki enhancing gadgets.