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Plenty of people talk about PMD Heroes who can't use their powers, but what about those who can't STOP their powers?
Picture, a Riolu hero who can't control their aura sensing so they're just constantly bombarded by people's feelings, overwhelmed by all the auras. So, they become a hermit, avoiding crowds and living a peaceful life, and if they ever get really overstimulated Partner just knocks them out and drags them somewhere quiet (more than once, Partner has been stopped by the police for this suspicious behaviour)
Eventually, Riolu learns to shut-off their aura-reading, and refuses to use it again. It's too personal, and they're too scared about going back to being a walking receiver for people's emotions. Until, Partner helps them come to the warming realisation that this power is not a bad thing, it can be used to help so many people.