They’re not exactly common, but they’re not unheard of, either. This world is a vast place, and while humans have been fairly ambitious in the past, in recent years, one could say we’ve done an excellent job at not colonizing every strip of land we’ve ever come across. That is to say, these sorts of villages do indeed exist in the plural, in the most remote parts of the world. These are places such as the Amazon rainforest or some parts of the Orange Islands that are typically too difficult for a person to reach, even with the assistance of a pokémon.
That is to say, it’s rather impressive that you’ve found these people, anonymous.