Increases power and hits all opponents on Psychic Terrain.
One other Pokémon on the field, selected by the trainer. Stolen moves reuse the same target.
Expanding Force inflicts damage. If Psychic Terrain is in effect and the user is grounded upon its execution, this move gets a 1.5× power increase in addition to the usual 1.3× bonus from terrain, and if the setting is a Double Battle, the move's target will be changed to hit both opposing Pokémon.