Yes but remember, in the wild, most pokemon are actually pretty low level and only know moves like scratch, sand attack, and tail whip. So, except for maybe fire types that might know ember, people probably aren't injured all too much. Of course, evolved, high level Pokemon can probably do more harm, but I imagine that in the Pokemon world, you really only see powerful, evolved Pokemon if they're being used by a trainer or in places that only a trainer would go anyway.