An elephant is so strong it can stampede humans and other animals to death. But, I'm sure there's an animal that could be pitted against it and win over it. If you had a long enough snake, it could constrict it. Mongoose vs. snake. Snake doesn't stand a chance.
A giraffe can and will kill a lion with a single kick. No matter which legs they use, it has been proven they can shatter a lion's skull. Giraffe wins hands down.
Can it kick to the side? If it can that it would probably always win. If not then the lion could win.
IT HAS EVERYTHING TO DO WITH IT. If it is snowy the grizzly will have a tough time seeing the polar cause most animals are colorblind. If it is a tropical climate the polar bear would sweat a lot because of his blubber.
saltwater croc vs great white shark the croc has an extremely strong bite , probably could bite the shark in half.
There used to be a show back in the early-mid '00s that did the same thing as this thread and that match up was actually on it. I do believe the shark won.