After Pokémon took over the world in the form of side games, anime, and dozens of toys, it was finally time for the series to have its first true sequel. Taking place three years after the first game and set in a whole new region, Gold and Silver had a similar story of becoming a Pokémon Master, but it introduced so much to the series. 100 new pocket monsters joined the stable, a day night cycle was added, you could now breed Pokémon, and thanks to the Game Boy Color’s main characteristic, the adventure was in color too.
GS also gave the series some needed continuity, especially in the endgame that reintroduced the Kanto region and all its Gym Leaders, including Red, the protagonist of the last game. The third game in the set, Crystal, upped the importance of story even more, giving a ton of background to the Legendaries that you’re chasing throughout the game. And in a tradition that continues to this day, it let players choose the gender of the hero. Gold, Silver, and Crystal ushered in a new era for Pokémon, proving the series was here to stay.