I've seen lists that have only the ghost titled listed in tournaments? Is the ghost getting a docked shuttle that can fire out the special arc and can attack again?

Here's an example list I saw:

Dash Rendar + Engine Upgrade + Heavy Laser Cannon + Push The Limit + Outrider + Kanan Jarrus (58)
Chopper + Fire‑Control System + Han Solo + Hera Syndulla + Ghost

The Ghost title does nothing unless you also field and pay the points for an Attack Shuttle with the Phantom title as well.

People might include it for fun. There's no penalty to including it on a Ghost without a shuttle, but there's no benefit either.

Well it would be an illegal list without the phantom, so better leave it off.

As thespaceinvader says, it's technically illegal to bring the title without also bringing an Attack Shuttle with the Phantom title. As a practical matter, if you don't have a Phantom it's a free title with no effect, so I don't see any reason to worry about it.

Interestingly, the Phantom title should be legal to run on an attack shuttle that's not docked. But no, the Ghost title's language about docking an attack shuttle and giving it the Phantom title isn't ultimatum. Including it in a list with a VCX and no Attack Shuttle is technically illegal.