>>46301188>>46300915>>46300968>>46300994SM takes place 10 years after RGB, a scenario writer from the famous deleted tweet mentioned that 3 years passes between GSC/DPPt and BW.
We also from the same tweet that B2W2 and XY occur at the same time, and Grimsley's concept art from SM mentions that it takes place 2 years after B2W2.
All the references to 20 years passing could just be a reference to real-life and not necessarily meant to reference RGB in-universe.
Mina's concept art from LGPE pegs her as 13-15 years old, since we know she's no older than 19 in SM/USUM due to the age limit on Trial Captains, this does create an incosistency.