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Only Gardevoirs and Gallades raised from youth by humans and accustomed to humanity behave like the Pokémon we know and love.
There are no confirmed reports of a human being killed or physically wounded by a wild Gardevoir. That is not to say they are harmless Pokémon. If they believe the human is some form of threat (and what constitutes a threat is often absolutely unknown to humans) they will toy with the person's mind. This can be benign, from making someone lose control of their bowels or flee in unnatural terror, to more eerie fates, like completely losing one's mind and becoming an empty shell or simply walking into the deep forest, never to be seen again.
Gardevoir earned its fairy type. Humans once whispered "Beware the Women of the Woods" as a warning. The rise of human industrial civilization meant human settlements quickly encroached on wild forests that once belonged to the fairies, and they simply disappeared and retreated further and further away as humanity encroached on their land.
The few wild Ralts that can still be captured today on roads are a far cry from their former glory. They scrape by a meager living in hostile territories, never being able to evolve since all they can do is hide from danger, scurrying in the dark until the day a trainer captures them or they are killed and eaten by some predator. But somewhere in the forests far away, they are waiting...