Tomy

If you mean ''what'' ghosts than yes.Maybe not all of them but i can always look at the location guide.

This leads me to assume you have the tools to add a ghost type early on in the game. Otherwise, the ghost selection is scarce, and if I remember correctly, you get your first ghost near Correy and Shade.

Im doing a ghost monorun, and believe me you're gonna need at least 3 starter ghosts or else you wont defeat flobot. I was lucky enough to defeat her mind you.