Aasgier, those usage statistics could argued to be invalid for the simple reason that many mons who are now banned from the tier were in for a majority of the time. That aside, if I must give reasons as to why Zangoose just doesn't fit well in the S-rank category anymore, other than the blatantly obvious, I will.
90 base Spe, though still pretty high, is practically the average base Spe seen in NU. I would agree with Zangoose being S-ranked if its ability raised Spe rather than its already fantastic Atk. That being said, Zangoose really doesn't have time to set up a much needed Swords Dance, what with its defenses being terrible and Spe being so average. I see it being like Lucario in OU, where it has to rely too heavily on its priority. Even then, QA fails to OHKO many pokemon who are faster than it, most obvious being Miltank and Tauros. Then we have the bane of its power, Toxic Boost, which, though could be seen as a blessing, is, also, a curse. It limits the potential of its sweeps and makes it even easier to revenge kill. Zangoose looks astounding on paper, I give it that, but when actually put in battle, I find it to be a little lackluster.
As for Gardevoir, I definitely use her, and she definitely doesn't do anything people say she does. Perhaps I'm using her incorrectly, however, her being proposed of being an S-rank mon, it's hard to believe she could be misused, no?
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