Poison-typePokémon have a natural toxic quality about them. Some Poison Pokémon naturally produce venom (Ekans and Arbok for example), some are plants with poisonous qualities (Bulbasaur and Oddish – these are dual Grass-and-Poison types), while others largely consist of poisonous material (such as Koffing or Grimer). Many Poison-type moves can cause the Poison status effect, which causes the attacked Pokémon to lose hit points each turn. The Toxic or 'badly poisoned' status effect causes the amount of damage done by the poison to double each consecutive turn. Some Poison Pokémon are considered to represent forms of pollution such as Koffing/Weezing (air pollution) and Grimer/Muk (toxic waste). Poison-types are immune to the Poisoned status effect. Poison-type Pokémon are considered excellent choices for use with defensive strategies, given that they are resistant to many popular types of Pokémon attacks and only vulnerable to two. Offensively, they fair less well in that many types are also resistant to Poison-type attacks, and that moves of this type tend to have low damage values or produce only status effects.
Effectiveness of Poison-type moves and of other moves against Poison-type Pokémon
Super effective against Pokémon of the types: and .
Not very effective against Pokémon of the types: , , , , and .
No damage at all against Pokémon of this type: .
Not very effective when attacked by attacks of these types: , , , , and .
Super effective when attacked by attacks of the types: , and .
Weaknesses and resistance
A type chart displaying the weaknesses and resistance of a Pokémon when damaged by a move. Empty fields are moves that do normal damage.
They're strong against the Fairy type because members of that type are pure in spirit but generally weak in body, allowing for easy corruption of bodily structures with natural toxins and poisons. Further, attacks from members of that type generally rely on a type of magic that cannot easily penetrate the poison-infused organic structures endemic to members this type.
They're strong against the Grass type because members of that type are dependent upon their environment for nourishment and are susceptible to absorption of corrupting toxins which have devastating effects on internal organic structures.
They're resistant to attacks from the Fighting type because members of that type employ primarily physical strength which is not very effective against the regenerative abilities and other adaptations common among members of this type.
They're weak against the Poison type because other members of this type have natural resistances to poison from carrying their own toxins.
They're weak against the Ghost type because members of that type do not have readily accessible bodily organs, requiring poisonous attacks to pass through a spiritual barrier before taking effect.
They're weak against the Bug type because members of that type have exoskeletons which are difficult for toxins to penetrate. Many members of that type have developed their own internal resistance due the production of their own poisons.
They're weak against the Ground type because earthen and sandy features neutralize and mitigate the toxicity of poisons, making them less effective. Further, they're susceptible to attacks from the Ground type because earth and sand smother the natural qualities of members of this type.
They're weak against the Rock type because the internal organs of the members of that type are not readily accessible from the outside, impeding the penetration of poisonous attacks and speed of action of toxic agents.
They're susceptible to attacks from the Psychic type because mental manipulation interferes with the natural resistances members of this type have developed to their own poisons, such as through overproduction, making internal structures especially vulnerable.
The Steel type is immune to attacks from members of this type because poisons cannot circulate through or penetrate solid, non-porous steel materials or body parts.