I used an Hariyama with Fake Out and Close Combat + a Magneton with Flash Cannon as first turn. Fake Out blocked Ninetales, who will use Aurora Veil(I had not Pokèmon with Brick Break), so Magneton could easily one-shot Ninetales. Then, Hariyama used Close Combat to destroy his Beartic (I have Charizard, his Rock Slide was a problem). Then, my Gothitelle with Rock Tomb helped me to lower Glaceon's speed. (Gothitelle can take one of Cold Truths and outspeed Walrein). With a Glaceon lower than my other Pokémon, my Froslass can easily outspeed that Pokémon and finish the job, with only a slow Walrein which was waiting to be defeated. Oh, Charizard has Flame Burst, which can destroy the special field until Angie's Pokémon will rebuilt it with Cold Truth, but I didn't use him.