Quoted By:
>Pocket Monsters Encyclopedia says Porygon was created in 1995 (the Kanto Pokedex also says the most recent tech was used for its creation)
>SM, released for the 20 anniversary, says Porygon was created with technology from 20 years ago, meaning it would take place in 2015 or so
>SM concept art says Grimsely last appearance was 2 years ago (so around 2013), and the famous timeline tweet says BW2 is parallel to XY (released in 2013)
>according to the same timeline, BW is before that (duh) but before GS and DP, which are contemporary, then at the start RG and RS are also contemporary
>we know SV is after SS because Sonia's book, and SS is after SM because Type Null
>back to the Pocket Monsters Encyclopedia we have the creation of Pokeball after a discovery in 1925, Japan. IRL, 1927 is when Paris finished the renovations commissioned by Napoleon
Gen 1 (and gen 3 by association) took place in 1995-1996, matching the release date.
Gen 2 (and gen 4 by association) took place in 1999-2000, matching the release date.
Gen 5 first game took place in 2009-2010, matching the release date.
Gen 5 second game and gen 6 took place in 2012-2013, matching the release dates.
Gen 7 took place in 2015-2016 like its release date.
Gen 8 and gen 9 must take place in 2019-2020 and 2022-2023 respectively.
Legends games take place around 70 years before the first generation.