About CM + Magic Guard Clefable, there are two things i want to bring up. The first is to move Stored Power from main slash to a Moves mention or even OO. In the analysis it says that it's useful for Mega Venusaur, Chansey, Unaware users, and Heatran. But Mega Venusaur already loses to CM Clefable without max SpA, and if it has max SpA then Clefable loses regardless of Stored Power or no, as Sludge Bomb usually 2HKOes Clefable, assuming Clefable used Calm Mind twice, once as Mega Venusaur came in and once after Mega Venusaur attacked. Which means that against offensive Mega Venusaur, Clefable can't boost fast enough for Stored Power to be of any use. Against Chansey, Life Orb + 80 SpA EVs Moonblast always 2HKOes, and you can always dick around with Flamethrower to fish for a burn in order to not get stalled out if Chansey is already in, so Stored Power is not really needed here either. Same with Heatran, +6 80 SpA Moonblast does 25% damage minimum to SpD Heatran, which is enough to get past it before you get PP stalled, as long as you don't play like an ass and mindlessly spam Moonblast. As for Unaware users, Quagsire is always 2HKOed by 80 SpA LO Moonblast after SR, so you only really beat Clefable, and maybe Heatran i guess, if you struggle to beat it even with LO Moonblast.
On the other hand, Flamethrower is pretty much what makes CM Magic Guard the threat it is, to any kind of team. Outside of Mega Venusaur, the only way of threatening Clefable after a boost offensively is with physical Steel moves, but Flamethrower makes most Steel-types think twice before switching in. Not to mention how dangerous being a free switch in for Mega Mawile is.
As for my second suggestion, i think that the spread when using Life Orb should be 252 HP / 176 Def / 80 SpA. The EV investment lets Clefable always 2HKO Quagsire after SR with Moonblast, always 2HKO Chansey at +6, and 2HKO SpD Gliscor 92.6% of the time at +1 compared to the 25% chance that you have without any SpA EVs, all very important feats when facing stall, leaving only Taunt Heatran and Unaware Clefable as roadblocks to Clefable, the second of which can be easily taken care of by any phazer, especially Heatran, which doesn't care at all about anything Clefable can do.
As far as i know, you are not 2HKOed by any important physical threat you weren't before, so i think Clefable can afford to use those SpA EVs.
Oh and i also think that LO should be the first item because it really fucks up stall badly, which is great, but this is very minor.