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). It now has an extra advantage against the new 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.

69
Poison type Pokémon
15
Single type Pokémon
54
Dual type Pokémon
27
Poison-type moves

Attack pros & cons

Tick Poison moves are super-effective against:

Grass Fairy

Cross Poison moves are not very effective against:

Poison Ground Rock Ghost

Cross Poison moves have no effect on:

Steel

Defense pros & cons

Tick These types are not very effective against Poison Pokémon:

Grass Fighting Poison Bug Fairy

Cross These types are super-effective against Poison Pokémon:

Ground Psychic

Dual-type attack pros & cons

This chart shows the strength of the Poison type against every type combination. The fraction of damage a Poison type move will deal is shown - ½ means 50% damage (not very effective), 2 means 200% (super-effective) and so on.

Nor Fir Wat Ele Gra Ice Fig Poi Gro Fly Psy Bug Roc Gho Dra Dar Ste Fai
Normal 2½½½½02
Fire 2½½½½02
Water 2½½½½02
Electric 2½½½½02
Grass 2222222222204
Ice 2½½½½02
Fighting 2½½½½02
Poison ½½½½½½¼½½½¼¼½½0
Ground ½½½½½½¼½½½¼¼½½0
Flying 2½½½½02
Psychic 2½½½½02
Bug 2½½½½02
Rock ½½½½½½¼¼½½½¼½½0
Ghost ½½½½½½¼¼½½½¼½½0
Dragon 2½½½½02
Dark 2½½½½02
Steel 00000000000000000
Fairy 2222422222220

Poison Pokémon stat averages

62.6
HP
Ranked #17
70.8
Attack
Ranked #16
63.7
Defense
Ranked #17
67.9
Sp. Attack
Ranked #13
67.4
Sp. Defense
Ranked #15
65.3
Speed
Ranked #10

Notable Poison-type trainers

Koga
Koga
Fuchsia City gym leader
Red/Blue/Yellow
Janine
Janine
Fuchsia City gym leader
Gold/Silver/Crystal
Koga
Koga
Elite Four
Gold/Silver/Crystal
Koga
Koga
Fuchsia City gym leader
FireRed/LeafGreen
Janine
Janine
Fuchsia City gym leader
HeartGold/SoulSilver
Koga
Koga
Elite Four
HeartGold/SoulSilver
Roxie
Roxie
Virbank City gym leader
Black 2/White 2

Poison Pokémon

There are 69 Poison-type Pokémon.
See also:

BulbasaurBulbasaur
#001 / Grass · Poison
IvysaurIvysaur
#002 / Grass · Poison
VenusaurVenusaur
#003 / Grass · Poison
Mega VenusaurVenusaur
Mega Venusaur
#003 / Grass · Poison
WeedleWeedle
#013 / Bug · Poison
KakunaKakuna
#014 / Bug · Poison
BeedrillBeedrill
#015 / Bug · Poison
Mega BeedrillBeedrill
Mega Beedrill
#015 / Bug · Poison
EkansEkans
#023 / Poison
ArbokArbok
#024 / Poison
Nidoran♀Nidoran♀
#029 / Poison
NidorinaNidorina
#030 / Poison
NidoqueenNidoqueen
#031 / Poison · Ground
Nidoran♂Nidoran♂
#032 / Poison
NidorinoNidorino
#033 / Poison
NidokingNidoking
#034 / Poison · Ground
ZubatZubat
#041 / Poison · Flying
GolbatGolbat
#042 / Poison · Flying
OddishOddish
#043 / Grass · Poison
GloomGloom
#044 / Grass · Poison
VileplumeVileplume
#045 / Grass · Poison
VenonatVenonat
#048 / Bug · Poison
VenomothVenomoth
#049 / Bug · Poison
BellsproutBellsprout
#069 / Grass · Poison
WeepinbellWeepinbell
#070 / Grass · Poison
VictreebelVictreebel
#071 / Grass · Poison
TentacoolTentacool
#072 / Water · Poison
TentacruelTentacruel
#073 / Water · Poison
GrimerGrimer
#088 / Poison
Alolan GrimerGrimer
Alolan Grimer
#088 / Poison · Dark
MukMuk
#089 / Poison
Alolan MukMuk
Alolan Muk
#089 / Poison · Dark
GastlyGastly
#092 / Ghost · Poison
HaunterHaunter
#093 / Ghost · Poison
GengarGengar
#094 / Ghost · Poison
Mega GengarGengar
Mega Gengar
#094 / Ghost · Poison
KoffingKoffing
#109 / Poison
WeezingWeezing
#110 / Poison
SpinarakSpinarak
#167 / Bug · Poison
AriadosAriados
#168 / Bug · Poison
CrobatCrobat
#169 / Poison · Flying
QwilfishQwilfish
#211 / Water · Poison
DustoxDustox
#269 / Bug · Poison
RoseliaRoselia
#315 / Grass · Poison
GulpinGulpin
#316 / Poison
SwalotSwalot
#317 / Poison
SeviperSeviper
#336 / Poison
BudewBudew
#406 / Grass · Poison
RoseradeRoserade
#407 / Grass · Poison
StunkyStunky
#434 / Poison · Dark
SkuntankSkuntank
#435 / Poison · Dark
SkorupiSkorupi
#451 / Poison · Bug
DrapionDrapion
#452 / Poison · Dark
CroagunkCroagunk
#453 / Poison · Fighting
ToxicroakToxicroak
#454 / Poison · Fighting
VenipedeVenipede
#543 / Bug · Poison
WhirlipedeWhirlipede
#544 / Bug · Poison
ScolipedeScolipede
#545 / Bug · Poison
TrubbishTrubbish
#568 / Poison
GarbodorGarbodor
#569 / Poison
FoongusFoongus
#590 / Grass · Poison
AmoongussAmoonguss
#591 / Grass · Poison
SkrelpSkrelp
#690 / Poison · Water
DragalgeDragalge
#691 / Poison · Dragon
MareanieMareanie
#747 / Poison · Water
ToxapexToxapex
#748 / Poison · Water
SalanditSalandit
#757 / Poison · Fire
SalazzleSalazzle
#758 / Poison · Fire
NihilegoNihilego
#793 / Rock · Poison