Dododex
ARK: Survival Evolved & Ascended Companion

Utility Tips

What is a diplocaulus used for? diplocaulus battling strategies in ARK: Survival Evolved.
If you want to imprint remember they can't get out of water, so to bypass the take oxygen option you can cryo it or use DS to reset what it wants. You will ask it to follow you (always underwater) a couple dozens of meters and cryo it again ultil it gets the +imprint from "wants to go on a walk with you" since that one doesn't require any interaction other than a whistle. I use a baryonyx to clear the place I'm in, set it to aggressive, to follow me, and objective distance=long.
Outside of not having saddle armor and being harder to tame, this little guy is essentially an upgraded Ichthyosaur. They give you oxygen like a scuba tank (abd available much much earlier) and are the best creatures for harvesting trilobites. Just don't expect much in the way of combat capability. You can't shoot off the back though, which reduces their usability for underwater taming. Perfect for resource cave runs. As they are amphibious you can take them over land to places other aquatics can't reach, although you will want a flyer to carry them because of how slow they are. Even a Pteranodon will work.
They're also skrunkly little salamanders, it's impossible not to love them.
I found that pairing this fella with a pteranodon is very useful. You can pick it up and fly into the water, which dismounts you and drops it. You can immediately get on the diplocaulus once in the water, and when you want to leave the water you can jump back on the pteranodon and pick it up.