This Dino is meant to bridge the gap between the rex and the carchar / giga, so it is going to be quite strong, I suggest the following items to make sure your taming process goes as smoothly as possible.

1.) Full ascendant flak (or anything stronger than flak) armor, the better armor rating the better (will protect you a decent amount if you get stunned off your mount by a microraptor)

2.) an agile creature with a decent health pool with the ability to shoot off the back of it while riding (I've heard trapping doesn't work with this creature)

3.) an ascendant 200+% damage pump shotgun (this creature is a knockout tame, but it requires damaging it heavily until it roars at you and glows red, then you can feed it a narcotics / biotoxin to knock it out)

4.) loads of biotoxin (try to bring atleast 300+ just to be safe)

5.) they spawn commonly in the redwoods, so be extremely weary of thylas and microraptors during the taming process. if you can, try to lead it away from the redwoods

anyways that's all for this tip, I hope it serves you well !^^