Pokemon: A Deep Dive Into Human Ghosts in the Series

"While the Pokemon series has ghost-type Pokemon, it is also not a stranger to literal ghosts. In fact, human ghosts have been in both games the TV series for a long time. Any veteran fan knows by now that human ghosts are a reality of the Pokemon universe. With humans ghosts as a reality though, that brings out many questions. For example, what is the difference between human ghosts and ghost Pokemon (since some ghost Pokemon evidently were once human)?" - click image for article