You team up with a Kirlia. She's very cautious around you because she can sense amorous desires coming from you.

If you pursue romance options she actually gets more uncomfortable and distant and may even leave the party.

If you make an effort to keep it to yourself, she lets her guard down a little and reveals the reason she isn't comfortable with that kind of affection is she'd much prefer to become a Gallade than a Gardevoir.

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If you give her a gender-changing magic item after that point, she'll put it on and change pronouns to he/him, evolve immediately, and he'll then be comfortable enough to begin returning your affections.

Whether you continue to pursue romance options or not after that point, it's revealed he stays with you after the credits, whereas endings with Gardevoir has her departing.