These are easy to knock out, Just get a bow and a bunch of trans arrows, Then keep shooting it and running away so it wont hit you, Then feed it mejoberries and then wait... Theres your bronto thanking you because you tamed it.
I recommend taming this as soon as you get the saddle! They’re a super easy tame, use a crossbow with about 25-80 depending on the level, hop on a pteranodon after shooting it once, land, hop off, shoot it more, rinse and repeat till KO. If you have boosted taming time, just use mejos and it’ll work fine. Up if this helped!