It's possible that IB/FS's charge charge up is a way to make it easy for less experienced players to have an easier time catching Kyurem. A item or Lv100 unlock that removes the charge up could be a "reward" for Kyurem in the same vein as Blue Flare and Bolt Strike were for Reshiram and Zekrom for getting to Lv100; both moves which are clearly superior to the other except for that odd moment when fighting N's Dragon who always using Fusion Flare/Bolt as it's first move, expect you to use you Fusion too (unfortunately, GF's "plan" didn't not go well, many probably use Dragonbreath instead).
In fact, instead of removing the charge up, said hyppothecial "reward/upgrade" should make said charge up an invulnerability period like Shadow Force, just so it's not too broken.
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