This game takes place pre-Gen 7, so Gale Wings probably won’t have the nerf.
I can see some great applications in this set. Here’s a set I could see.
Adamant Nature, 128 EVs in Speed and Attack, 252 in HP
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Brave Bird, yes, is a must
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Defog has always been one of Crobat’s greatest calls, and it gets priority now!
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Roost for the same reasons you listed above
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U-Turn for a quick getaway