Had an idea for Gardevoir. She would have no emotional connection to anyone and have instead used rare candy to evolve but ended up being dependent on it since their strength of their psychic power depends on their emotions for others so she is fully evolved but extremely weak powers. She could shyly ask the MC what it feels like to be loved and he ends up having sex with her which is the very best feeling she has ever felt and tasted in her life and better than the candy. She goes from weak to ungodly strong psychic power from her very first orgasm plus her biggest. She senses she is going to be pregnant and will use her power to protect the children/gift he leaves her to remember him by. She can start making new rare candy that the MC sees in a shop that makes him remember her.
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The reason why the rare candy is rare is because of her eating so much of it to make it hard to find and its really a placebo effect for the sugar in it makes her believe herself stronger when really its just the sugar rush effect that she seriously craves but finds the MC cum better and finally makes a emotional connection to others and she realizes the candy never did anything to her but some cavity's. Once she stops looking for the candy it just regular candy with ALOT of sugar not called rare candy anymore.