As with other releases of the games, Pokémon Black & White not only added new abilities, but it added new effects to old abilities. This page is to detail all of the abilities that have had an update and the details of the new effect.

Stench

US Name: Stench
Jp. Name: Stench (あくしゅう)

Effect:
The stench helps keep wild Pokémon away.

New Effect:
Increases the chance that the opponent will flinch when you make Physical Contact with them.

Pokémon With Ability In-Game:
Grimer, Muk, Stunky, Skuntank, Trubbish, Garbodor

Pokémon With Ability Via Dream World:
Gloom

Sturdy

US Name: Sturdy
Jp. Name: Sturdy (がんじょう)

Old Effect:
The Pokémon is protected against 1-hit KO attacks.

New Effect:
The Pokémon cannot be knocked out by one attack. If an attack would have knocked it out from Full HP, the Pokémon keeps 1HP.

Pokémon With Ability In-Game:
Geodude, Graveler, Golem, Magnemite, Magneton, Onix, Sudowoodo, Pineco, Forretress, Steelix, Shuckle, Skarmory, Donphan, Nosepass, Aron, Lairon, Aggron, Shieldon, Bastiodon, Bonsly, Magnezone, Probopass, Roggenrola, Boldore, Gigalith, Sawk, Dwebble, Crustle, Tirtouga, Carracosta

Pokémon With Ability Via Dream World:
Relicanth, Regirock

Lightningrod

Name: Lightningrod (ひらいしん)

Effect:
The Pokémon draws in all Electric-type moves.

Additional Effect:
Renders the move powerless and raises the Pokémon's Special Attack.

Pokémon With Ability In-Game:
Cubone, Marowak, Rhyhorn, Rhydon, Electrike, Manectric, Rhyperior, Blitzle, Zebstrika

Pokémon With Ability Via Dream World:
Pikachu, Raichu, Goldeen, Seaking, Zapdos, Pichu

Storm Drain

Name: Storm Drain (よびみず)

Effect:
The Pokémon draws in all Water-type moves.

Additional Effect:
Renders the move powerless and raises the Pokémon's Special Attack.

Pokémon With Ability In-Game:
Shellos, Gastrodon, Finneon, Lumineon

Pokémon With Ability Via Dream World:
Lileep, Cradily, Maractus

Keen Eye

US Name: Keen Eye
Jp. Name: Keen Eye (するどいめ )

Effect:
Prevents the Pokémon from losing accuracy.

Ammended Secondary Effect:
Wild Pokémon of any level lower than this Pokémon are less likely to be encountered.

Pokémon With Ability In-Game:
Pidgey, Pidgeotto, Pidgeot, Spearow, Fearow, Farfetch'd, Hitmonchan, Sentret, Furret, Hoothoot, Noctowl, Sneasel, Skarmory, Wingull, Pelipper, Sableye, Starly, Chatot, Patrat, Watchog, Ducklett, Swanna, Rufflet, Braviary

Pokémon With Ability Via Dream World:
Starly, Glameow, Stunky, Skuntank, Skorupi, Drapion

Plus

US Name: Plus
Jp. Name: Plus (プラス)

Effect:
Boosts Sp. Atk if another Pokémon has Minus.

New Effect:
Boosts Sp. Atk if another Pokémon has Plus or Minus.

Pokémon With Ability In-Game:
Plusle, Klink, Klang, Klinklang

Pokémon With Ability Via Dream World:
Mareep, Flaaffy, Ampharos

Minus

Name: Minus (マイナス)

Effect:
Boosts Sp. Atk if another Pokémon has Plus.

New Effect:
Boosts Sp. Atk if another Pokémon has Plus or Minus.

Pokémon With Ability In-Game:
Minun, Klink, Klang, Klinklang

Pokémon With Ability Via Dream World:
Electrike, Manectric