Tamed a level 300 with a soothing balm 10x and just fed it with raw prime meat. If you can afford resources, go make a diplo kibble or make use of ambers to create a diplo kibble in the chef's station. The soothing balm can be looted from any cave but i recommend looting at skylord's artifact cave(near blue obelisk) because it gives 2 soothing balm cave and obelisk are just near specially with flyer. You can also trick the game by making game saves and restore if you dont want tribute loots.