Psychic Terrain is a non-damaging Psychic-type move that creates a terrain that envelops the field and replaces the background environment and any other terrain that is already in effect. The terrain fades after five turns.
This terrain has the following effects on Pokémon that are on the ground and not in the semi-invulnerable turn of a move.
It prevents affected Pokémon from being hit by opponents' moves with increased priority (including moves boosted by Prankster, Gale Wings, or Triage).
Moves that target all Pokémon (except Perish Song, Flower Shield, and Rototiller) and moves that target all foes cannot be blocked by Psychic Terrain even if they become priority moves.
It boosts the power of Psychic-type moves used by affected Pokémon by 30% (regardless of whether the target of the move is affected by Psychic Terrain).
If a Pokémon is holding a Psychic Seed while the field is Psychic Terrain, it consumes the Psychic Seed and its Special Defense is increased by one stage.
Terrain Extender extends the longevity of the terrain from 5 turns to 8.
When a Pokémon with the Ability Psychic Surge enters battle, Psychic Terrain is automatically created which lasts for 5 turns
By Egg Move