The unbound energy vortexes I believe have 130 wrestling.
In order for a pet to gain skill it's skill must be within about 25 points (estimate) of the monster's skill that it is fighting.
Pet Training - UOGuide, the Ultima Online encyclopedia
As fa as the crazed guys go, their wrestling seems to vary, their tactics I am unsure about.
I brought my brother's rune beetle to the crazed guys starting at about 83 wrestling and 85.4 tactics, after fighting many crazed guys the beetle is now almost gm wresting but the tactics hasn't budged.
Discord probably has something to do with the beetle gaining in wrestling. It took quite a while for it to actually gain even once, and at that time it actually ended up gaining 3 times, then it was at least 3 more crazed guys before it gained again.
Also strangely, my brother's Nightmare started with less tactics at the same time and even less wrestling (both in the 70s), and it is now gm tactics. Odd.