Plague von Karma
Banned deucer.
A bit late to the punch here, but I think it may have been intended given all Ghost-types in the game are ""weak"" to Psychic by virtue of their part Poison-typing. Unlike some type-based changes in Stadium - in this case, Struggle affecting Ghost-types - the Ghost VS Psychic interaction was never changed. Then again, Bug VS Poison wasn't either, so you could argue that they were abiding by the actual type chart to a T.I'm curious: Now that at least some of RBY's source code has leaked, do we know what could have caused this? In the final release with all developer comments and such stripped out, the relevant data is literally just three bytes translating to "Ghost Psychic 0.0" (when Ghost hits Psychic apply 0.0x multiplier), which isn't much to go by. Maaaybe they typo'd and switched the order of the two types? But there's no proof of that without the source code.
Just thought I'd throw some ideas around, as this is actually super interesting to me.