Really?
I'll give you the benefit of the doubt, lets start off ignoring the 8 year olds singlehandedly lifting 50+pounds pokes and assume normal natural strenght on everything, so one chomp from a T-rex kills anything.
Anything flying is immune to it, but lets pretend a dodrio or pigeot can't damage it with scratches and pecks so its a draw at most.
What about fire/ice types in general? A T-rex can't just eat something on fire/frozen and shrug it off, and fire/freezing would certainly harm and scare one.
You can say ghosts die to a lick, but how do you justify the abra line not winning with telekinesis?
What about onyx and golem, are they made out of fucking paper mache or does this Trex have adamantium bones and teeth?
Why aren't wolverine's teeth adamantium?