I bring Baryo inside the cave to gain artifact of clever and pack! They’re good on both land and sea. Pump its health and damage, then you’re good to go! Ps: if you don’t have kibbles to tame it, use prime fish meat by aggro-ing sabertooth salmon with sickle.
Baryonyx are quick like Allosaurus and do just as much damage (but don't get a pack bonus). They don't use oxygen for swimming and can sprint in the water. Right click in the water does an AoE stun that lasts about 10 sec. Their 'C' is a... Taunt? They also jump and you can fire a weapon from their back.
It's like a small Allo combined with a Kapro, in my opinion. Useful on both land & in the water. Use its secondary attack while swimming to stun, attack, and harvest. Does NOT stun Cnidarias, though, so do not expect to overpower them.