Life hack for PC players that don't know this yet, go to crystal isles and explore the lower beaches, you'll encounter squids beached ashore, you should have the black pearls and any tanky mount, i used my HP like rexes so it just tickled them ez.

Get your dino in between the tentacle area then punch the tuso in the mouth till it agros, then feed. I'll usually let go of your mount due to world collish but you can just agro it again when it's ready to eat. - Survivor Kure