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Headcanon time: Gardevoir hearts sell for extremely high prices on the black market. It is possible to remove them without killing the Gardevoir, but it removes their Psychic abilities and cripples them with constant pain.
For this reason Gardevoir are often kidnapped from their Trainers by various gangs and villainous teams, leaving literally heartbroken Trainers to care for their now decrepit friends and/or waifus.
The worst part is that some Trainers willingly subject their Gardevoir's to the surgery, since the potential profit from selling the heart is just too great. Worse still, the Gardevoir will never protest the procedure, since the undying love they have for their Trainer means they will always either ignore or respect their greedy intentions, in spite of their own wellbeing.