Ghost Path is home to, you guessed it, ghost pokemon. There's the occasional Eevee or evolution that wanders in, but other than that, it's dead.
You're in for some trouble if you don't have one of those Dark-types found so rarely before Route 1. There's the occasional abandoned house where you can stay the night and hope that you'll be safe in the morning, or you can head right on down the path and hope for the best.