Poison type

The Poison type is regarded as one of the weakest offensively. Prior to Pokémon X/Y it was super-effective only against Grass (many of which are dual Poison so neutralizes the effect). From X/Y onward it has an extra advantage against the Fairy type. In the first generation it was also super-effective against Bug but this was changed. It fares a little better defensively but its best advantage is through status moves like Toxic. In Generations 1-3, all Poison type moves were categorized as Physical.

At a glance

Pokémon

Single-type

Dual-type

Moves

Average base stats

69.1

Attack

74.4

Defense

69.5

Sp. Atk

72.5

Sp. Def

72.2

Speed

69.3

Poison type matchups

Effective against

×2

grass fairy

poison ground rock ghost

×0

steel

Vulnerable to

×2

ground psychic

grass fighting poison bug fairy

×0

Poison type effectiveness

Poison type Pokémon are immune to poisoning.
However, the Corrosion ability allows the Pokémon to bypass that immunity.
The move Toxic will never miss when used by a Poison type Pokémon.
Poison type Pokémon (that are not raised) switching into battle will remove the effects of Toxic Spikes.
The items Toxic Plate and Poison Barb increase the power of Poison type moves by 20% when held.
The Poison Gem increases the power of a Poison type move by 30% when held, and is then consumed.
The item Black Sludge heals 1⁄16 HP each turn when held by a Poison type Pokémon, rather than being damaged by it.
The Kebia Berry, when held, neutralizes a super-effective Poison type move.