based on the title, here are the gears i have to reach 95% Neutral Resist.
+5 Deviling Party Hat = 5%
Great Old Hauberk = 10%
Vigilante Shield + Parasite Card = 15%
Winged Cardigan + Deviling Card = 60%
Poring GM Pet / Kyuumi Pet = 5%
***The Deviling Party Hat to be at +10 to achieve 100% Neutral Resist.
Here is a link to the screenshots showing differences in damage with and without those equips: https://imgur.com/a/NMVyLtL
I haven't tested these equipment in Tier Z of Gold Cedi since that's the only Boss I know that casts a weird version of Earthquake. (damage can't be lessened with GTB Card unlike Orc Knight's Earthquake).
I think there are better builds for Gold Cedi, which I don't know, I just use my usual Cedi Prof Gears in that area and I rely on Wall of Fog, Assumptio and Yggs as my crutches.