The “fairy” type made it’s debut in which generation of the Pokemon core series games?

The Fairy type made its debut in the 6th generation of the Pokémon core series games. This addition was significant as it introduced a new type of Pokémon that was strong against Dragon-type Pokémon, previously considered the most dominant type. The addition of Fairy-type brought balance to the game and introduced new strategic elements for trainers to consider, making it a notable and impactful addition to the series.