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>original Kanto is playable on the 3DS through RBY for the virtual console
>Johto and (updated) Kanto are playable in HGSS
>Hoenn is playable in ORAS
>Sinnoh is playable in DP and Platinum
>Unova is playable in BW and BW2
>Kalos is playable in XY
>Alola is playable in SM
>there's literally one region from the mainline games that can't be played on the 3DS
>seven generations, seven regions, seven islands
It all comes together