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Psychic types (especially the more powerful ones like alakazam or the more empathetic ones like gardevoir) seem like they'd be good for therapy for all sorts of mental illnesses/disorders/irregularities. Alzheimers, autism, mood disorders, maybe even things like psychosis or something.
When you think about it, there's tons of practical applications for the powers of pokemon that don't really get brought up in the various media.