I think there should be at least one relevant creature that can 2-hit KO Monolorhino reliably, on even grounds. Apart from for that I don’t think I’d change anything.
Could you make me see your ideal of monolorhino?
I would make rend or distraction resistance go away but not both, and probably the group shield to bellow/instant invincibility as it already has a priority move, and keep the taunting shield as such. Change cunning to nullify strike from its base donor, maybe?
I think stat wise and kit wise it’s perfect as It is, what i think needs change is some resistances. Rend and bleed shouldn’t be that high. I think i would keep them but much, much lower. Or remove rend entirely and keep only 50% bleed? Idk, something along those lines that would allow some stuff to 2 shot It. Since It is a tank It is problematic that It has both those resistances