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I would play absolutely any mainline Pokemon game and almost any spinoff Pokemon game, so yes. As to whether I'd like it - it depends if it were good, if the tone shift felt justified by the story, if the grind felt meaningful, so on so forth.
Even if it was amazing and I loved it... If it wasn't accessible at all to kids and the game couldn't stoke a child's imagination at all, I'd complain.
I don't think children's media actually needs to be ultra colourful Nintendo childish to appeal to children, though. (I secretly believe ultra colourful, ultra childish Nintendo stuff mostly appeals to adults.)