Pajamas
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A friend of mine made top cut at a spring BR, relying somewhat heavily on a Rayquaza ex tech. Unfortunately, she discovered that Rayquaza is exceptionally useful against pretty much everything except Empoleon. As soon as Rayquaza lands on your bench, he becomes the primary target of Dual Splash. After just one hit, you're easily in KO range, while you can't OHKO anything worthwhile in their deck without Lake Boundary. Even if you manage that, trading two prizes for one is not going to pay great dividends. Despite Rayquaza's type advantage, you'd probably be able to spread a lot more damage per prize with Exeggutor.