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Gardevoir are sensitive spirits, and empaths, who swim in the emotions of people around them.
They would know if anyone nearby has any desire to harm them, and they would KNOW if you harbor secret thoughts about having sex with them. And personally, I doubt they'd be interested..
Point is, the only people who could ever train a Gardevoirr are those who see it as something other than a meat puppet. If you cannot set down your lustful nature, and do your best to be purehearted, a Gardevoir would never choose to hang near you.