Before we start, I want to say that I love Batman, but I believe the writers of his comic books make him seem too powerful for only a human. And that's why people think he can't be beaten, saying "Batman always wins" or "Because Batman". So, I will give four Marvel superheroes who can defeat Batman.
Before we continue, I would like to point out that Batman could not do any research on them and find these heroes' weaknesses. The DC universe and the Marvel universe are in alternate realities. If they were all in the same universe, it may be a different story.
1) Iron Man
Some may disagree with this one, but it will make more sense as you read. One, Tony Stark May is just as smart as Bruce Wayne is, most likely. Second, if Batman destroys Tony Stark's suit he was already wearing, Stark can just call in another. And who's to say that Tony Stark won't just call in The Hulkbuster? I don't think Batman could defeat Stark when he's in the Hulkbuster.
Once again, we have a very controversial one here, but just wait and read. It'll make sense. So, Spider-Man has web shooters and his spider sense, so he can deflect weapons and sense them. He has enhanced speed, strength, agility, and reflexes. On top of that, he is as smart as Reed Richards/Mr. Fantastic. Then, he also has super sight and somewhat advanced hearing. And he can heal from a broken arm in only a matter of days. That's some pretty convincing material there, isn't it?
Despite being blind, Daredevil is still a force to be reckoned with. From his lack of fear to his super advanced hearing, he has abilities that the Caped Crusader could not match. Daredevil has advanced senses of everything - besides sight, obviously -, is trained in hand to hand combat, knows how to take a beating like a boss, and has advanced reflexes and agility. This may be very, very hard for Daredevil to win, but I think that Daredevil could, after one of the longest fictional fights ever, defeat the Dark Knight.
4) The Black Panther
Batman isn't the only one at peak human physical condition, as proven by the photo above. T'challa is one of the smartest characters in Marvel and is possibly smarter than Tony Stark. Black Panther also wields a vibranium uniform. And for those who don't know, Vibranium is what Captain America's shield is made out of and is one of the strongest fictional metals ever. If you want more proof, there's more in the photo above, such as superhuman senses and master of all known forms of martial arts.
I believe that there are more heroes like Captain America, The Punisher, and Moon Knight who could at the very least give Batman a run for his money in a fight, but I kept it down to four. I hope it proved that Batman is not unbeatable, and I truly do hope you enjoyed it. Also, if you disagree, please comment below and tell me why. I would love to know your thoughts. Well, Until next time, Goodbye and thanks for reading!!!