Rare creature spawns
Solution 1:
Go to the place where the boss bloodwing was in the mission wildlife exploitation reserve and it will spawn The Mother Rakk, it's a giant rakk. it's not very hard to kill. Can drop rare loot, but no idea if it drops any legendary though. There is Savage Lee which you can find in three horns Divide living among bullymongs and he has a chance to drop that Unkempt Harold, which is by many players considered to be the best pistol in the game. There is Scorch in Frostburn Canyon, could drop Hellfire legendary SMG. There are loot midjets that can be found in many maps through the game, but if you don't finish the mission Doctor's Orders there will always be 2 loot midjets and 2 loot midjet robots in the 4 small boxes in wildlife exploitation where they run experiments on skags. They can drop many legendaries. These aren't really rare but they are hard to find. Except for Scorch a side quest leads you to him. Good luck :)