I've always liked the subtle characterisation of Blue ditching his Raticate for team members with more potential, but I used to find it odd that he did so immediately after it evolved (i.e. at the time when it would have been at its strongest relative to other Pokemon of the same level). Now, though, I think it helps tie together the little tidbits we learn about him beyond the basic jerk rival persona.
His initial interest in being a trainer and filling up the Pokedex seems to stem more from childish oneupmanship than anything else, but it's quickly established that he has a genuine knack for both. He's already completed 40 entries when you meet him on the S.S. Anne, a feat he's managed while always being one step ahead of you. In Silph Co., he says that by working on the Pokedex, he's "starting to see what's strong and how they evolve" and his resulting intuition for Pokemon potential is exceptional; aside from legendaries and Dragonite, the Pokemon he adds to his team after ditching Raticate all end up being the strongest or tied-strongest representatives of their types, at least based on Gen 1 BST.
In FRLG, the rest of his team all grows two levels between the Cerulean and S.S. Anne battles, but his Rattata only gains one, even though that one level netted it a big power boost via evolution, which you'd expect would encourage Blue to train it more. It seems like he dumps Raticate so quickly because, once it evolves, he immediately intuits that this is as strong as it will ever get. Giving him access to knowledge that a first-time player likely doesn't have and having him deploy that knowledge with such ease and efficiency adds an interesting layer to a character that doesn't actually get much development or even dialogue.
His initial interest in being a trainer and filling up the Pokedex seems to stem more from childish oneupmanship than anything else, but it's quickly established that he has a genuine knack for both. He's already completed 40 entries when you meet him on the S.S. Anne, a feat he's managed while always being one step ahead of you. In Silph Co., he says that by working on the Pokedex, he's "starting to see what's strong and how they evolve" and his resulting intuition for Pokemon potential is exceptional; aside from legendaries and Dragonite, the Pokemon he adds to his team after ditching Raticate all end up being the strongest or tied-strongest representatives of their types, at least based on Gen 1 BST.
In FRLG, the rest of his team all grows two levels between the Cerulean and S.S. Anne battles, but his Rattata only gains one, even though that one level netted it a big power boost via evolution, which you'd expect would encourage Blue to train it more. It seems like he dumps Raticate so quickly because, once it evolves, he immediately intuits that this is as strong as it will ever get. Giving him access to knowledge that a first-time player likely doesn't have and having him deploy that knowledge with such ease and efficiency adds an interesting layer to a character that doesn't actually get much development or even dialogue.
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