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The most "Japanese-y" Pokemon is Meowth.
It's a cat, which is popular in everywhere, but shit, have you seen those fucking Japanese cat magazines? And Shoko-tan, is, well... yeah.
It's based on a traditional Japanese myth of the Maneki Neko. As a kid, I guarantee every single one of you was like "Where's its nose?" "Why are its whiskers like that?" "What's that metal thing on its head?" It's even stylized to be overly Japanese-y.