>>58164397This is because Dynamax energy, without going through a Trainer and their bracelet, makes the Dynamax Pokemon go out of control.
This has been seen with Gym Leaders' Pokemon. It's also been seen with Perseus, whom Leon arrested.
Similarly, a wolf that experiences Dynamax energy starts to go mad.
It's possible that, since wolves already faced Eternatus 3,000 years ago and are therefore covered in scars, they reject Dynamax energy as if it were antagonistic to them, because it comes from the being they're fighting.
In the same vein, we have Calyrex, who has a blue Dynamax. Blue is the color of Calyrex's psychic powers when he grows carrots or controls a character to speak human language. I suspect it mimics Dynamax energy or controls it with its own psychic powers to keep from going crazy. It's also a Pokemon that was traumatized by Eternatus 3,000 years ago. It supposedly fought him and lost, causing it to lose its original power and become fearful of humans.
Incidentally, I think this is also a way to make Zacian and Zamazenta less powerful.