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Fuck it, I'm just gonna plug it:
If you're dissatisfied with modern Pokemon, check out Digimon Story: Cyber Sleuth (Complete Edition).
It's a Digimon RPG where you work as a detective, with a slightly older audience in mind.
It has some fucked up cases like a Digimon kidnapping people into the virtual world, convincing them it's real life, then cutting up their bodies and selling them, and the victim's consciousness is permanently trapped in the virtual reality.
You can digivolve and de-digivolve any Digimon to any Digimon, and they can retain all non-signature moves.
Warning though: There's a lot of reading. Feel free to mash through it, though.