It really doesn't make much of a difference, you can get anything shiny without RNGing your ID/SID in BW2 anyway (there aren't even roamers to worry about).
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Black 2 FC:
My Pokécheck Pokémon
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?