One drawback of Psychic-type moves is that they don't affect Dark-type Pokémon, although this immunity can be removed with Miracle Eye. Immunity, along with resistances to psychics, can also be circumvented with cover moves such as Earth or Fight attacks. The Psychic type has few absolute strengths, however, he also has few weaknesses. In the first generation it ended up being massively dominated, mainly due to the complete lack of powerful movements of insects, its only weakness.
In addition, a bug in the game meant that Ghost-type moves had no effect on Psychic (although this only affected the low-powered Lick). Generation 2 corrected the situation with the addition of the Dark type along with better Pokémon and moves of all kinds. When entering into battle against Psychic-type Pokémon, it is worth knowing what its weaknesses are. Psychics are weak against Bug, Ghost, and Dark-type Pokémon.
Dark types are especially useful, since they are immune to psychic movements. Psychic Attacks Are More Effective Against Fighting Pokémon and Poison. They are only weak against Psychic Pokémon. Psychic-Dark-Ghost's triangle of advantages is tricky.
Psychic-type moves have no effect on Dark-type Pokémon, which were introduced in Generation II specifically to counter the overpowered psychic types of Generation I. Dark-type movements are very effective in both psychics and ghosts. Ghost type moves are very effective on Psychic types, but not very effective on Dark types. Psychic moves don't affect Dark Pokémon, which is a big weakness that can be used against them.
Psychic-type Pokémon are not effective against Steel-type Pokémon in Pokémon GO. So if a trainer is going to fight Metagross, for example, you'd better leave any Psychic Pokémon on the Pokedex. Since at that time, the only types of Ghost were also part Venom, and the only other weakness of Psychic, Bug, was incredibly weak in itself, the Psychic type was incredibly dominated. The most powerful psychic attack is unique in that it has no effect unless the victim is asleep.
Shadow Ball is inherited from Hypno and is a great way to surprise other psychics with solid and ultra-effective damage. Since many Weed Pokémon were also Poison type, it wasn't a good idea to use Weed against Psychics either. In particular, every Psychic-type attack introduced before Generation IV was still a special attack, with physical psychic attacks only introduced from Generation IV onwards. Of course, this also means that it makes little sense to bring a Psychic Pokémon to fight another Psychic Pokémon.
There is no systematic data on the average duration of Pokémon battles, but certainly most of them have ended in just a few rounds, and it is possible that the lower PP of Psychic will not prevent your Pokémon from performing until it has already defeated several enemies of the opposing team. A defense against the fighting type is good, but it's still not that good because most psychic Pokémon are lousy when it comes to physical defense. A psychic-type Pokémon is any Pokémon that specializes in certain moves that use psychic themes to damage or inflict status effects on an opponent. Psychic and Psybeam are equally accurate, but the first one is almost 40% more powerful and seems like the obvious choice.
The fraction of damage that will be inflicted by a psychic-type move is shown: ½ means 50% damage (not very effective), 2 means 200% (super effective), etc. Many Pokémon are of this type and, being the type with the most legendary Pokémon, for many, the Psychic type is the most powerful. In particular, every psychic attack introduced before the fourth generation was still a special attack, physical psychic attacks were only introduced from the fourth generation. However, the analysis here suggests that, overall, Psychic has a better chance of getting the job done.