They are as catchable as the rest! The other stuff is just a bonus. :)
Bob wouldn't know he died, or specifics like how/when he became a pokemon, but he would maybe have a sense of things being 'back to normal' and getting 'a second chance', so to speak. Hence, he'll feel a STRONG URGE to get things done that he wasn't able to do before! The ghosts can be from other regions, though a majority will be from Kanto and Johto, drawn back to the places they lived in.
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Bob wouldn't know he died, or specifics like how/when he became a pokemon, but he would maybe have a sense of things being 'back to normal' and getting 'a second chance', so to speak. Hence, he'll feel a STRONG URGE to get things done that he wasn't able to do before! The ghosts can be from other regions, though a majority will be from Kanto and Johto, drawn back to the places they lived in.