What is the reason there are no dark/psychic dual type Pokémon in

All Dark-type Pokemon weaknesses & resistances - Charlie INTEL

Psychic (type), Fantendo - Game Ideas & More

Pokémon Go Halloween Cup team recommendations, including dates, rewards and restrictions explained

Pokemon Evolution-- Lugia - Hypermon - Evolution - TapTap

All Dark-type Pokemon weaknesses & resistances - Charlie INTEL

15 best Psychic-type Pokemon ever: Mewtwo, Calyrex & more - Dexerto

All You Need To Know About Fairy-Type Pokemon

Ranking the 5 best Pokémon type combinations - Dot Esports

Pokémon type chart – strengths, weaknesses, and typings explained

Is there a ghost and psychic type Pokemon? - Quora

All About Psychic-Type Pokémon: Strengths, Weaknesses and Strategies in Pokémon FireRed and LeafGreen - Master Noobs

What is the reason there are no dark/psychic dual type Pokémon in the main series? Is it possible that they exist but were left out by Game Freak? - Quora

The Best Dark Type Pokémon, Ranked

25 Pokémon With The Fewest Type Weaknesses

A Pokémon Type Chart Guide