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Gardevoir has existed for almost 20 years. There were children who are now in college who were born after she was created. And in that time, she has never been surpassed. She is the first Pokemon waifu, from which all others are derived. Lopunny, Tsareena, Mawile, Braixen - every couple of years there's a handful of new ones, and every time Gardevoir remains on top. Sure, every now and then you get one that panders hard to the fetishists (like Salazzle) but nobody is as universal as Gardevoir, and everyone else just competes for her scraps.
When we are dead, she will still be at the top. Gardevoir is forever.