I'd have to say RSE. It introduced so many new things. I say one of the most important was Evs. Now pokemon like tyranitar could hit much harder if given the right Evs. It also introduced natures, abilities, and a bigger range of Ivs. Suddenly, pokemon could be different from each other besides just their base stats and move pool. It also introduced some key pokemon to standard play. Some of the more noteworthy ones being metagross, salamence, and swampert. In RSE one could also use more specified strategies, such as a sunny day team.
I'll admit, GSC was a pretty noteable addition to pokemon. It included items, introduced to SkarmBliss combo, and somes game breaking new pokemon, like curselax and marowak(when passed an agility anyway), and the steel and dark types. But for some strange reason, for me it just pales in comparison compared to RSE.
I'll admit, GSC was a pretty noteable addition to pokemon. It included items, introduced to SkarmBliss combo, and somes game breaking new pokemon, like curselax and marowak(when passed an agility anyway), and the steel and dark types. But for some strange reason, for me it just pales in comparison compared to RSE.














