Just a minor nitpick, on your 252/252 EV spreads you still have 4 EVs left over. It's not much, but I have had Pokémon survive an attack with 1-2 HP left in the past, so 4 EVs actually can make a difference sometimes.
Also, if you want to use Discharge, and you're still focused on using under-used Pokémon, then how about replacing Cresselia with Musharna? It plays very similarly, trading some of the bulk for more Special Attack. You'd lose Ice Beam, but HP Ice hits just as hard with the extra SpA behind it anyway.
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RNG is kind of like firing a gun. Why shoot blindly in every direction until you're lucky enough to hit the target when you can just take the time to aim properly and hit it with one shot?