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HOENN CONFIRMED FOR X/Y
theres this guy (among several other trainer hints)
theres the unused train station in couriway
the couriway train description that mentions the railway bringing people from great distances to see the falls
and theres the professor evaluating your national dex saying "you caught all ___ of these pokemon IN THE KALOS REGION" like why would he specify the kalos region if we couldnt visit another
theres no way we cant visit another region eventually
theres no way