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Pressure deducts an additional PP from a move that targets the wielder, the wielder's side, or both sides (including Imprison and Snatch). If multiple Pokemon have Pressure, the effect stacks. Pressure will not take effect on allies' moves. Pressure also gives a message when the wielder switches in stating that it has Pressure. If the move's user changes, Pressure's effect only applies to the original user. Moves selected by Sleep Talk, Assist, or similar moves will not lose PP.
When a Pokemon with this ability is first in the party, wild encounters have a higher chance of occurring.
Pressure is a pretty average ability but it has been known to have been useful in the past, on sets such as Rest + Sleep Talk Calm Mind Suicune (Crocune) and SubRoost Zapdos. Unfortunately those are still the best options in OU today, as most Pressure users reside in the Uber tier. Ho-Oh can pull off a good SubRoost set there too.
Found in Dream World