Very easy tame! Just go by a rock while getting hit, so you don’t go far away, and go under the diplo. Keep feeding it mejoberries, and wala you have a diplo. Keep in mind the little bonks don’t hurt so don’t be afraid by that.

How to get a diplo:

Know that it is easiest to passive tame them, which means walking up to them and feeding them

Get a TON of berries, everytime you feed it, it will go up like 3-5%

Have a high speed, high attack flying dino, (high attack in case you "miss click")

HAVE PATIENCE, diplo's are a stubborn tame, they will push you playfully (hence the flying dino)

MAKE SURE there are no carnivores around, if there are carnies around it will attack it there is a chance of it dying, it will get rid of all your hard work, and most importantly, IT MAY DIE (R.I.P. attempted tame #1 + 2 😢)

Plz note I am not an "high level player" that has a giga, I am lvl 50, (51 at the time I wrote this, almost 52) so I am not that experienced, tho I am sorta, I don't know that much about the game

UP IF HELPFUL

When passively taking, keep in mind that there is a large gap of time between their first food item and second. Afterwards the food drain proceeds normally

You need about 100 Mejoberries. You should probably tame it around a bushy area, so you can keep collecting berries. Do not attack a Diplodocus! Just get close and start feeding it mejoberies. Feed it one mejoberry every time it says to. Diplodocus will knock you around during taming. This is not an attack. It's just playing.

Passive tamed a level 12 (+5 levels) with 15 mejoberries. If you can situate yourself under it’s legs, specifically between the two front ones, the diplo will continue to try and bump you back but will be unsuccessful. It will do this move over and over again, and drain its stamina and hunger faster, which leads to a faster tame.

When there wild there pretty slow

But when there tamed....

ZOOOOOMMMM

When taming or fighting, you can stand under their belly and not be knocked back. It may take a few trys but they do no damage to you anyway.

The first time you feed it it goes really slow but after that it’s like every 15 seconds(berries)

If passive taming you can stand in a specific spot under the front-middle portion of its belly and it will continuously try to boop you but it won't be able to reach you, allowing you to just stand there until it wants its feedings.