1996: RG
1998: RB
1998: Y
1999: GS
2000: C
2002: RS
2004: FRLG
2004: E
2006: DP
2008: HGSS
2009: Pt
2010: BW
2012: Gen 3 remakes (BW engine) - Special RS Ten Years
2013: BW2
2014: XY
2015: Z
2016: Gen 4 remakes - Special DP Ten Years
2016: FRLG remakes - Special 20 years
2018: Gen 7 for NSwitch
2020: Gen 5 remakes - Special BW Ten Years

A remake every 4 years, once per gen.
Every post-johto gen of 4 years.