Ability₁₇₈-Pressure

💥In Battle💥
When another Pokémon (including an ally) uses a move targeting a Pokémon that has Pressure, when ᴾᴾ(Power Points) is deducted from that move, 1 more ᴾᴾ than usual is deducted. (⁻2ᴾᴾ)
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⚠️If multiple targets have Pressure, each one results in additional PP being deducted.
🟢Gen³
Pressure deducts additional ᴾᴾ whenever ᴾᴾ would normally be deducted; this means that it still applies even if the move misses, has multiple targets, or is rendered ineffective due to a target's typing or use of Protect or Detect.
⚠️Pressure applies to moves that target the entire field, such as Rain Dance.
⚠️Pressure applies to Curse when used by non-Ghost-type Pokémon, but only when used by a wild Pokémon or in-game Trainer.
🔴Gen⁴
If a Pokémon that has Pressure is sent into battle, a message "Pokemon is exerting its Pressure!" is now displayed.
🔵Gen⁵⁺
Pressure now only affects opponents' moves.
⚠️Pressure increases the ᴾᴾ consumption of an opponent's Imprison and Snatch even though those are self-targeting moves; in Snatch's case the additional ᴾᴾ is consumed even if Snatch fails or snatches a move from a Pokémon other than the one with Pressure.
⚠️It increases the ᴾᴾ consumption of Spikes, Stealth Rock, and Toxic Spikes, but not Sticky Web.
⚠️If a Pokémon uses Tera Blast while one of its opponents has Pressure, the additional ᴾᴾ will be deducted even if the Pressure Pokémon is not the move's target.
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🛤️Outside Of Battle🛤️
⚠️Wild Pokémon's calls for help are more likely to be answered when facing a Pokémon with Pressure. (It shares this effect with Intimidate and Unnerve).
⚠️From Pokémon Emerald onwards, if a Pokémon with Pressure is in the first slot in the party (even if fainted), there's a 50% chance that a Pokémon will be forced to the upper bound of their encounter level range. (It shares this effect with Hustle and Vital Spirit).
🎣When fishing with a Pokémon with Pressure, Vital Spirit, or Hustle as its Ability leading the party in Pokémon Emerald, Pokémon Brilliant Diamond and Shining Pearl, or any Gen⁴ game, it will trigger with its standard 50% activation rate.
🎣In the Gen⁵ games, Pressure, Vital Spirit, and Hustle will not have any effect on the levels of wild Pokémon found through fishing.
🟣Gen⁸
Pressure appears to have no effect on the level range of wild Pokémon.
🟡Gen⁹
Pressure appears to have no effect on the level range of wild Pokémon.
~Bulbapedia