Dododex
ARK: Survival Evolved & Ascended Companion
Tips & Strategies

Faster swimmer than my 140.5% Movement Speed character with flippers, with base speed it can outswim pretty much any wild ocean creature.
Can be used to lure Mantas into taming pens at pretty early levels, and is much more maneuverable than any other amphibious mount. When ridden, can also side-strafe and VERY slowly swimm backwards if you so wish.
Pump some Health and Speed only.
More Diplocaulus Utility Tips
These guys are the kings of trilobite hunting. Not only do they deal additional damage to them, they're great at collecting chitin, oil, and pearls. Other perks: they don't need a saddle to be ridden while in the water, they provide you with oxygen underwater, and are faster than just about anything while swimming. Super underrated mounts imo.
Please listen to me! I haven't had these guys for long, but I noticed their healing was very low, about 0.1, while on land. When I went into the water with it so it could swim, the healing went up to about 1.2 per second. But the biggest thing is, I force fed it meat to heal, like with all carnivores. If you do this in the water, it heals hundreds with just a few pieces! I am going out to the seas in a bit. Knowing this healing factor will help a lot!