Pokémon Ruby and Sapphire/Abilities

Ability	Description
Air Lock	Cancels weather effects (such as rain) in battle. E.g. Rayquaza.
Arena Trap	Prevents the foe from fleeing. Doesn't work against flying-type Pokémon or ones with the ability to Levitate. E.g. Trapinch. Extra effect (Emerald only): Increases chances of meeting wild Pokémon.
Battle Armor	Prevents critical hits. E.g. Crawdaunt.
Blaze	Increases the power of fire-type attacks to 150% when HP falls below 1/3.
Chlorophyll	Raises the Pokémon's speed when the sun is bright.
Clear Body	Prevents an opponent's move (such as Tail Whip) from lowering stats like attack power and speed. E.g. Beldum.
Cloud Nine	Cancels weather effects (such as rain) in battle.
Color Change	Changes your own Pokémon's type to match the foe's last move. E.g. Kecleon.
Compoundeyes	Raises accuracy 30% for all moves. Extra effect (Emerald only): Increases chances of finding wild Pokémon holding items.
Cute Charm	Infatuates the foe on contact 30% of the time. Extra effect (Emerald only): Increases the chance of meeting Pokémon of the opposite gender.
Damp	Prevents the use of Selfdestruct and Explosion.
Drizzle	Summons rain in battle. E.g. Kyogre.
Drought	Summons sunlight in battle. E.g. Groudon.
Early Bird	The Pokémon awakens quickly from sleep.
Effect Spore	Afflicts the foe with poison, paralysis, or sleep 10% of the time when it attacks directly.
Flame Body	Burns the foe on contact 30% of the time. Extra effect (Emerald only): A Pokémon egg will hatch sooner with the Pokémon anywhere in the team.
Flash Fire	The Pokémon becomes more powerful if hit by a fire attack. Pokémon does not get damaged by Fire attacks.
Forecast	Changes type and appearance with the weather.
Guts	Attack is boosted to 150% if the Pokémon is inflicted with a status condition.
Huge Power	Increases attack, but the effect is halved when abilities are swapped.
Hustle	Attack is boosted to 150%, but accuracy goes down to 80%. Extra effect (Emerald only): Increases the chances of meeting wild Pokémon of a higher level.
Hyper Cutter	Prevents the reduction of the user's attack power. Extra effect (Emerald only): The radius of using cut in grass is increased.
Illuminate	Encounter rate increases when Pokémon is in lead position.
Immunity	Prevents poisoning.
Inner Focus	The Pokémon cannot be forced to flinch.
Insomnia	The Pokémon cannot fall asleep.
Intimidate	Lowers the foe's attack power. Extra effect (Emerald only): Decreases the chances of meeting wild Pokémon of lower level.
Keen Eye	Prevents loss of accuracy. Extra effect (Emerald only): Decreases the chances of meeting wild Pokémon of lower level.
Levitate	Not hit by ground-based attacks.
Lightningrod	Draws electrical moves away from a partner in a double battle. Extra effect (Emerald only): Increases the chances of being called on the PokéNav.
Limber	Prevents paralysis.
Liquid Ooze	Causes damage to foe when Leech Seed, Absorb, or other HP-sucking attacks are used.
Magma Armor	The Pokémon cannot be frozen.
Magnet Pull	Prevents steel-type Pokémon from fleeing from battle. Extra effect (Emerald only): Increases the chances of meeting wild steel-type Pokémon.
Marvel Scale	Defense is boosted to 150% if the Pokémon has a status condition.
Minus	In a double battle, when a Pokémon with Plus is the partner, special attack is multiplied by 1.5.
Natural Cure	Status conditions are healed upon switching the Pokémon out of battle.
Oblivious	Prevents the Pokémon from becoming attracted to the foe.
Overgrow	Increases the power of grass-type attacks to 150% when HP falls below 1/3.
Own Tempo	Prevents the Pokémon from becoming confused in battle.
Pickup	May pick up items.
Plus	In a double battle, when a Pokémon with Minus is the partner, special attack is multiplied by 1.5.
Poison Point	Poisons the foe on contact 30% of the time.
Pressure	Doubles the foe's use of PP, making it run out of stamina. Extra effect (Emerald only): Increases the chances of meeting a wild Pokémon of higher level.
Pure Power	Increases attack, but the effect is halved when abilities are swapped.
Rain Dish	Slight HP recovery in the rain.
Rock Head	Prevents recoil damage.
Rough Skin	Recoil is imposed after physical attack on the Pokémon with this ability.
Run Away	Makes fleeing from battle easier.
Sand Stream	Summons a sandstorm.
Sand Veil	Increases the Pokémon's evasion in a sandstorm. Extra effect (Emerald only): Decreases the chances of meeting wild Pokémon during sandstorm.
Serene Grace	Doubles the chance that an attack's secondary effects (such as status conditions) will work.
Shadow Tag	Prevents the foe's escape.
Shed Skin	Gives Pokémon a 30% chance of curing status conditions every turn.
Shell Armor	Blocks critical hits.
Shield Dust	Prevents an attack's secondary effects.
Soundproof	The Pokémon is not affected by sound-based moves.
Speed Boost	Gradually boosts speed every turn.
Static	Paralyzes on contact 30% of the time. Extra effect (Emerald only): Increases the chances of meeting wild electric-type Pokémon.
Stench	Helps to repel wild Pokémon.
Sticky Hold	Prevents the foe from stealing items. Extra effect (Emerald only): Increases the chances of fishing wild Pokémon.
Sturdy	Negates one-hit knockout attacks.
Suction Cups	Firmly anchors the body to the ground, preventing the Pokémon from being switched out of battle. Extra effect (Emerald only): Increases the chances of fishing wild Pokémon.
Swarm	Increases the power of bug-type attacks to 150% when HP falls below 1/3. Extra effect (Emerald only): Increases the chances of hearing wild Pokémon's cries.
Swift Swim	Speed is increased when it is raining.
Synchronize	Passes status problems onto the foe. Extra effect (Emerald only): Increases the chances of meeting wild Pokémon of the same nature (personality).
Thick Fat	Cannot be burned or frozen.
Torrent	Increases the power of water-type attacks to 150% when HP falls below 1/3.
Trace	Copies the foe's special ability.
Truant	Moves only every other turn.
Vital Spirit	Prevents the Pokémon from falling asleep. Extra effect (Emerald only): Increases the chances of meeting wild Pokémon of higher level.
Volt Absorb	The Pokémon absorbs electric attacks, turning it into HP.
Water Absorb	The Pokémon absorbs water-based attacks, turning it into HP.
Water Veil	The Pokémon cannot be burned.
White Smoke	Prevents an opponent's move (such as Tail Whip) from lowering stats like attack power and speed. Extra effect (Emerald only): Decreases the chances of meeting wild Pokémon.
Wonder Guard	Only attacks with a type advantage will afflict damage.