*Sion nods approvingly at that*

An understandable precaution, and certainly most Pokemon are quite strong enough to carry it out.

That said, they do tend to instinctively be inclined to obey their trainers, so if it's a concern of yours, I'd recommend working with a couple to train them to discern what is and isn't you acting in your right mind. While it can take some effort it's quite possible to teach them to respond to alternatives, or stop listening to 'you' temporarily.