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Manually calculating Gengar's Hex damage with my Sp. ATK held items.
Wise Glasses are interesting. They give a solid ~10% Hex damage boost most of the game, which starts at +12% at level 7 and scales down(!?!) to +8.2% by level 15.
Then you have Shell Bell and Sp. ATK Specs.
Which appear just. fucking. terrible for damage.
Maybe Specs could give you a relevant boost at item lvl 20 if you somehow get 2 dunks in before hitting Haunter but I'm scared to level mine up anymore.
Shell Bell just seems irredeemable.