These are the most violent creature in game. You need at least 3 people, 10 Gigas max level, a platform quetzal, with cannon balls about 250 minimum. A couple rex's hopefully max level health. Now build a simple trap out of metal spikes. Now find one of these beasts, very carefully line up your Gigas, and rex's. These are sacrifices for the Coelacanth to eat while you shoot carefully from your queztal, have the other people shoot as well. Finally feed the beast kibble.