[Scripting Question] How to make Special Fighting moves Super Effective on Ghosts, while making Physical moves x0 on them?

[SuperSpyroDragon64]

In my Types.PBS, Ghost is Immune to fighting.

But as I've seen in the code for how Odor Sleuth and the held item Iron Ball work, this can be bypassed.

So how do I make Physical Fighting moves deal x0 to Ghosts, and Special Fighting moves deal Super Effective damage to Ghosts?

def pbCalcTypeMod(moveType,user,target)
ret = Effectiveness::SUPER_EFFECTIVE_ONE if defType == :GHOST && specialMove? moveType == :FIGHTING
end
end