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Porygon was created in 1995 in Sylph Co.
Red wars 96 shirt. Lets say RBY took place in that year.
Porygon pokedex entry says it was created 20 years ago.
Meaning RBY takes place 19 years before SM.
Red/Brendan Journey +3 years Ethan/Lucas Journey + 12 years BW + 2 years BW2/XY+ 2 years SM/USM
Red started at 11 and is 30 in SM.
Rby/gsc 3 years gap is mentioned in gsc.
Bw/bw2 2 years gap is mention in bw2
Bw2 sm gap is mentioned in Grimsley's artwork.
So taking back the assumption that red journey takes place in 1996 then there is a 12 years gap between the ds story and black/white 1.
We know SV takes place after SwSh because Sonia has published her book.
SwSh is probably in a distant future since we have 0 mentions of past npcs.
