Like Melee Mewtwo said, there really is no need for Light Screen when trying to beat Kyurem-W. Just pick a faster pokemon (Palkia is especially good, as he is naturally faster and can run an effective Scarf set if you think Scarf Kyurem-W will be a bigger threat than Specs Kyurem-W) and you'll be in the clear. Stealth Rock is also huge in defeating Kyurem-W. Taking 25% per switch-in on a choice-locked set will make it a LOT easier to kill. For instance, 252 SpA Palkia Spacial Rend vs. 0 HP / 0 SpD Kyurem-W: 366-432 (93.6 - 110.48%) -- guaranteed OHKO after Stealth Rock. No problem.
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