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Never wrote anything about it, but I once toyed with the idea of James/Kojira when he runs away from home, where instead of eventualy become a member of team Rocket, he goes on to become a legit trainer.
He's extremely gullible, due to his sheltered life, and would get scammed one way or another in almost every chapter. The second pokemon he gets is a Magicarp, sold to him by the same guy as from the show. It would serve a similar role to Psyduck, until it evolves into awesome.