I know it's weak to Dark type, and I think it's weak to Ghost type but I'm not sure.
every game has the same types and weaknesses. as usual psychic is weak to bug and dark type Pokemon in all games, not just Pokemon platinum.it's also weak to ghost
If you mean the Fight type then they are weak against the Flying and Psychic type pokemon. If you meant all pokemon's strenghts and weaknesses, then just type "Pokemon Battle Chart" in your search engine. It should come up with multiple options. I hope this helps.
Psychic Pokemon, as well as in any other Pokemon game are weak to the types; Bug, Dark, and Ghost. However, Psychic has no effect at all on Dark Pokemon.
Psychic type Pokemon are weak to Dark, Bug and Ghost type moves. Psychic Pokemon can also struggle against Steel types as not all Psychic Pokemon can learn moves effective against them. Overall the best type to use against Psychic types is the Dark type. Since the Dark type is not only super effective against them but is also immune to Psychic moves.
Answer:it all depends on what you're facing, but Sableye and Spiritomb have no weaknesses.
Psychic. Although all types of attacks excep normal attacks affect a ghost pokemon but psychic is most effective.
No type! But spritomb AND sableye have no weaknesses.
Bug, Ghost, and Dark type moves are all super effective against Psychic-type Pokemon. As these are considered basic fears of the mind and would be the weakness of a Psychic which fights using its mind.
dark, bug, and ghost are all super effective against psychic type pokemon.
Machamp is a fighting type Pokemon all fighting Pokemon are weak against flying types and psychic types that use flying type and psychic type moves so Pokemon like pidgeot or alakazam will do good against machamp.
Go to this website: http://www.serebii.net/pokedex-dp/psychic.shtml
Bug, Ghost, and Dark type moves are all super effective against Psychic-type Pokemon. As these are considered basic fears of the mind and would be the weakness of a Psychic which fights using its mind.