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OP here
So seeing replies I can see how "Gas type" sounded kind of retarded, but let me try and justify myself
When I said "Gas" I dont mean "100% gas" or "living gas" but more of how fire types are with fire, they can control it, create it, and it can even be part of their bodies.
This is how ghost types would be with this certain kind of gas.
The Gas which ghost types control would be strong enough to lift light objects, which is how ghost types like ghastly and driftblim lift themselves. and it would be able to be manipulated by ghost types (and even non-ghost types) to make ghost-type attacks like shadow ball.
This would also be why normal and fighting don't affect it, because you cant really "punch" gas
The gas, in its own way, would be sort of "alive" similar to how even though Magicargo is lava and molten rock, its still a living creature.
Driftblim and Drifloon are filled with this gas so they use it to fly around
Golurk uses this gas to manipulate and move giant golem structures created by humans
and Ghastly, Haunter, and Gengar are almost entirely made up of this gas (Similar to how slugma is almost entirely made out of lava) and because of how their bodies are 95% gas they use it to accomplish "supernatural" feats like phase through walls and take the appearance of a shadow.
Maybe this just makes sense in my mind but I really like this theory.