Many players who try to build the best competitive teams in Pokémon Brilliant Diamond & Shining Pearl include a Psychic-type Pokémon in their party. Although Psychic-type Pokémon have weaknesses to Bug-, Ghost-, and Dark-types, the different type combinations of various Psychic-types improve their resistances.
Psychic-type Pokémon are the perfect counters for the best competitive Fighting-type Pokémon in BDSP, particularly because Fighting-type Pokémon usually have lower Special Defense stats.
Read more on screenrant.com