>>24848616Except animals like dogs use mostly body language, tones, volume, and emotion to communicate. For example, a dog appearing rigid, still, staring at you, and silent means he's about to fuck you up. Long, wailing howls means the dog is nervous or bored.
Animals like parrots can be taught human languages to the point where they don't just mimic, but can communicate with their handlers.
It makes more sense that professors made up names like Pikachu because it is in fact a rodent-like animal that shoots electricity from its body, rather than 'dur it says Pikachu sometimes'.
Pokemon saying their names was for marketing.