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Just curious have you considered using Thundurus-Therian for late-game setup instead? What Thundurus-T has over Zapdos is stronger immediate damage, base speed, and access to nasty plot (which in my opinion would be better as you're not as reliant on your opponent's stat drops, and can be used...
> Pelliper moves OU, even though it's species mostly serves as rain setters
> Floatzel and Barraskewda remain in UU, even though they're the best swift best swim users at the moment.
I'm confused :P