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I did date a girl for a while who was pretty wapanese (she basically only liked me because she had an Asian fetish).
She played a ton of Pokemon and dragged me to anime conventions.
She also read a lot of hentai and had some pretty kinky tendencies in bed.
Aside from that, on several occasions girls have come up to me while I'm playing Pokemon. They usually say that they like to play as well. Since that's pretty rare I get in to talking about my team, type coverage, staying up late waiting for leaks, and she usually leaves thinking I'm a freak. I usually leave thinking she's a casual.
So as much as anything else, basically.
To those that think Pokemon actually hinders your romantic efforts--it's you, not the game.