Pokémon games have stayed true to many of the original concepts introduced back at the franchise's inception in the late 1990s, through all nine generations. The idea of battling the Gym Leaders to end up at the Pokémon League is a prime example of this, as players have had to get through 8 Gym Leaders before taking on the Elite Four, in most of the games - Sun & Moon and Sword & Shield had their own unique spins on things.