In one of the Pokemon Centers in Lumiose City, there will be a trainer who references the fact that Professor Oak's grandson came to the Kalos region. Professor Oak's grandson, generally referred to as "Blue" when in reference to the video games and the Pokemon Origins anime series, happened to be your rival in the original Pokemon games of Red, Blue, and Green on the GameBoy. He was quite well known for his call when leaving rival battles: "Smell ya later!"
Submitted By: KeyBlade999
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