http://www.newsweek.com/red-dead-2-rdr2-legendary-bear-walkthrough-location-tips-reward-hunting-1190064

The Legendary Bear in Red Dead Redemption 2 is just a small part of the story. Dutch and his gang (including you, Arthur Morgan) had a hard go of it in this, the winter of 1899. After a disastrous heist in Blackwater, not only have you lost a couple men, but have to now hide in broken-down shacks, waiting for the mountain passes to thaw enough to unstick your wagons. But soon enough you’ll find your way down, out of the mountains, to Horseshoe Overlook, a great place to hideout in the woods near the town of Valentine. And sure, you can go into town, be a roustabout, hold up a general store, get drunk, but you can also indulge a bit of the slow life now that your survival is no longer imperilled. How about a nice two-day hunt with your mentor, Hosea?

Once the camp at Horseshoe Overlook is set up and you’ve scoped out Valentine, you’ll be able to find Hosea past the horse stands. In town, he’s stolen a map pointing to the location of gigantic Legendary Animals. Would you like to go hunting a mottled, half-ton bear?