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>gen 3 introduces form changes with pokemon like castform and deoxys
>gen 4 and 5 continue adding pokemon with form changing gimmicks like giritina, rotom, shaymin, sawsbuck, etc...
>gen 6 goes crazy, introduces megas, super sayian form changes for tons of old pokemon
>gen 7 abandons megas and instead introduces regional variants, a way for them to lazily do recolors of old pokemon
>gen 8 kills megas entirely, replaces them with megas but big form changes, and keeps piling on lazy recolors
>gen 9 barely touched on regional variants with only wooper and tauros getting them, but instead introduced regional variants that are new pokemon and form changes for old pokemon which are actually new pokemon because even making multiple forms for existing pokemon was too hard so instead they just tweak existing mons and call them new
I am fucking sick and tired of form changes and lazy recolors. Megas and Regional Variants have done irreparable damage to this series.