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After all my games as Clefable in SoloQ, I figure out how to make it work(for me atleast), build her full resistances like a Tank so she won't be one shotted and can defend Goals almost like Blissey.
Full Blue+Purple, maybe try to squeeze in some White or Green, and for items just stack resistances with Focus Band/Assault Vest/Rocky Helmet, using this setup she'll last longer in fights and be harder to poke down, and it'll be easier for her to get in the fight for Gravity or Follow Me(Synergizes with Rocky Helmet and the shields from Passive and Ability with the resistances boosts synergizes with your Full Resistance Build making you quite Tanky), also this helps with using Draining Kiss since you won't just blowup trying to get close.
You don't do damage anyways no matter how much Special attack you have, and besides Special Attack only matter for the healing, but what is the point of it, if you'll be dead before you even have the chance to heal anyone, so why not build for survival so you can be actually around to heal your team? Live Longer Heal More.
I think this will be the build for me, I've been successfully climbing SoloQ Rank with it ever since.