That would depend on the species of bear. For instance, a lion could more than likely defeat a black bear, but a grizzly bear would be a far more dangerous opponent.
A tiger, as they are bigger and they can take down a brown bear, whilst a lion is smaller and can't kill a brown bear.
The brown bear because it would stand up and claw the three lions to death by swiping them with its paws.
A lion would beat a brown bear, grizzly bear, and black bear. But for a polar bear, it would be a draw. Brown bear. Brown bears were put to fights with lions before, and the brown bear simply killed the lion.
polar bear
The atlas bear would win.
a lion mostly
It depends on who is bigger. If the black bear happened to kill the lion, the black bear would get badly injured.
The grizzly bear would probably win
A bear. Bears (especially Brown Bears) are much larger and stronger than a lion, and would overwhelm and crush it.
The giant black bear would win, but it would be injured.
Neither as the black bear is from North America and the lion from Africa and Asia. They never meet in nature.
In this hypothetical scenario, the hyena, being the size of a grizzly bear, would likely have the advantage due to its larger size and strength. It would have a better chance against the African Lion in a fight.