Psychic moves in the Pokemon games have always been wild cards to some degree. For the most part, the damaging Psychic moves all have fairly good accuracy ratings, making them very reliable. The non-damaging Psychic moves, of which there are many, are quite varied in how they affect the game/opponents. Most inflict a status effect on the enemy, raise the stats of the user, lower the stats of the opponent, or have a unique ability like swapping stats or items with the opponent.