I found a max level basi at the shores of the South West tropical islands right next to my base. Roughly 80, 30. Ofcourse it had the usual mantas and a couple of Megalodons. But I was able to take them out in the air with a compound bow and sinomacrops. Afterthat, easy taming. Use exceptional Kibble for faster taming! They take a long time to get hungry the second time. After that, itll tame quickly