Quite mobile for its size, it can run pretty fast. A good berry gatherer early game, and only berry gatherer. Its defence is only fast running and knocking off enemies. Although skilled - or sick on a head - can use it to deal some significant damage to other players by knocking them off the cliff.
Everyone saying the Diplo needs a tail whip attack and platform saddle, seriously if you want that get a bronto, the Diplo has its purpose and so does the bronto, making one into the other makes one redundant and totally useless. Brontos are attackers and portable bases, diplos are a hybrid of speed and capacity, no one would complain about a gallimimus that can carry eleven people and still have space to spare for three tonnes of cargo, but they do complain about a Diplo which is essentially that in terms of functionality.
I got an idea if the tamed diplodocus can attack.So it is like an upgrade for the saddle (that might make it cost more) that adds sharp spikes on its head so when it pushes enemies not only the get knockback they will also get hurt which means we can level up the attack of the diplo.Thats just my idea and yes I think the do deserve a tail whip attack cause they really need a defence in the wild man....
Not as useless as you might think! A high-level spino was terrorizing a nearby river. I took my diplo (Dylan) and while the spino was focused on killing Dylan, I was using my crossbow and rifle to do damage to it. Spino ended up dead, while Dylan was at 2000 out of 3000 health, and I was not injured at all.