Step 1:you tame the dolphin shark thing that’s a passive tame (they eat meat)
Step 2: you get at least 10 more tranqs than Dododex says (in case yah miss)
Step 3: get dolphin shark thing saddle
Step 4: go of the edge of the huge drop off in the ocean on yah dolphin shark thing
Step 5: start shooting
This method ensures that the bronto won’t attack you when you start shooting it. I’ve used it before and am currently taming a lvl 17. Don’t worry about megs, from what I can tell, they don’t attack you if you’re riding the dolphin shark thing, I sat right next to one on mine (sorry Fire Fin). Mantas won’t attack either.
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!