Ghost Grey Type Chart: Every Matchup, Including the Ones This Hack Changes

Ghost Grey adds Fairy to the type chart, keeps older Steel behaviour, and changes a few matchups outright. Of the 361 attacker/defender pairs, the ROM's own list names 117 -- everything else is neutral. The table below is generated from that list.

• Five immunities: Electric into Ground, Ghost into Normal, Ground into Flying, Poison into Steel, Psychic into Dark.
• Normal and Fighting both hit Ghost for neutral damage here, instead of doing nothing at all.
• Ghost is neutral against Ghost and against Psychic. The ROM states the Psychic one explicitly at 1x.
• Steel still resists Ghost and Dark at 0.5x, the pre-Generation VI behaviour this FireRed-era hack keeps.
• Fairy hits Dragon and Dark for 2x, is hit for 2x by Poison and Steel, takes 0.5x from Dragon rather than being immune to it, and takes neutral damage from Bug.
• The ROM also carries a nineteenth type slot, typeless, with no matchups attached.

259 of the 291 species are part Ghost, so Ghost's own matchups are the ones worth memorising first.

Related: egg groups & breeding, rival battles and the gym leaders.