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Burning a Foretress with Will-o-Wisp from my Giratina ended up winning me the game. It came down to my Ferrothorn vs my opponent's Foretress, and the Foretress would've done enough damage to kill me if it weren't burned.
Just faced a Blissey/Zoroark/Walrein/Latios/Tyranitar/Blaziken team.
Walrein had Rollout. Latios knew Outrage. And there was a ChestoRest Blaziken with Earthquake.