It really depends on the Pokémon's personality. All three of my Psychics are mostly coherent, but whenever they try getting a read on my Aerodactyl, they only ever pick up jumbled up growls and death threats.

[...Yeah, it's a long story, and Riku winces just thinking about it, bringing one hand to his arm, fortunately free of bite marks by now.]

Best bet's to just try getting its attention somehow.