Types
Effective Against
The Gen 1 type chart: which type's moves deal extra or reduced damage against which other type. Rendered as a 15x15 grid - attacking types as rows, defending types as columns. Only non-neutral cells are stored; every other cell reads as grid_default (1.0, neutral). Verified against research/Pokemon_Yellow_GBC.md SS6, not re-derived from memory - Gen 1 differs from every later generation in several of these cells (see the per-row comments below).
Every cell not recorded reads as
1.0 .
Effective Against lookup
Pick one
—
Bulbasaur
(Grass, Poison)
Ivysaur
(Grass, Poison)
Venusaur
(Grass, Poison)
Charmander
(Fire)
Charmeleon
(Fire)
Charizard
(Fire, Flying)
Squirtle
(Water)
Wartortle
(Water)
Blastoise
(Water)
Caterpie
(Bug)
Metapod
(Bug)
Butterfree
(Bug, Flying)
Weedle
(Bug, Poison)
Kakuna
(Bug, Poison)
Beedrill
(Bug, Poison)
Pidgey
(Normal, Flying)
Pidgeotto
(Normal, Flying)
Pidgeot
(Normal, Flying)
Rattata
(Normal)
Raticate
(Normal)
Spearow
(Normal, Flying)
Fearow
(Normal, Flying)
Ekans
(Poison)
Arbok
(Poison)
Pikachu
(Electric)
Raichu
(Electric)
Sandshrew
(Ground)
Sandslash
(Ground)
Nidoran (F)
(Poison)
Nidorina
(Poison)
Nidoqueen
(Poison, Ground)
Nidoran (M)
(Poison)
Nidorino
(Poison)
Nidoking
(Poison, Ground)
Clefairy
(Normal)
Clefable
(Normal)
Vulpix
(Fire)
Ninetales
(Fire)
Jigglypuff
(Normal)
Wigglytuff
(Normal)
Zubat
(Poison, Flying)
Golbat
(Poison, Flying)
Oddish
(Grass, Poison)
Gloom
(Grass, Poison)
Vileplume
(Grass, Poison)
Paras
(Bug, Grass)
Parasect
(Bug, Grass)
Venonat
(Bug, Poison)
Venomoth
(Bug, Poison)
Diglett
(Ground)
Dugtrio
(Ground)
Meowth
(Normal)
Persian
(Normal)
Psyduck
(Water)
Golduck
(Water)
Mankey
(Fighting)
Primeape
(Fighting)
Growlithe
(Fire)
Arcanine
(Fire)
Poliwag
(Water)
Poliwhirl
(Water)
Poliwrath
(Water, Fighting)
Abra
(Psychic)
Kadabra
(Psychic)
Alakazam
(Psychic)
Machop
(Fighting)
Machoke
(Fighting)
Machamp
(Fighting)
Bellsprout
(Grass, Poison)
Weepinbell
(Grass, Poison)
Victreebel
(Grass, Poison)
Tentacool
(Water, Poison)
Tentacruel
(Water, Poison)
Geodude
(Rock, Ground)
Graveler
(Rock, Ground)
Golem
(Rock, Ground)
Ponyta
(Fire)
Rapidash
(Fire)
Slowpoke
(Water, Psychic)
Slowbro
(Water, Psychic)
Magnemite
(Electric)
Magneton
(Electric)
Farfetch'd
(Normal, Flying)
Doduo
(Normal, Flying)
Dodrio
(Normal, Flying)
Seel
(Water)
Dewgong
(Water, Ice)
Grimer
(Poison)
Muk
(Poison)
Shellder
(Water)
Cloyster
(Water, Ice)
Gastly
(Ghost, Poison)
Haunter
(Ghost, Poison)
Gengar
(Ghost, Poison)
Onix
(Rock, Ground)
Drowzee
(Psychic)
Hypno
(Psychic)
Krabby
(Water)
Kingler
(Water)
Voltorb
(Electric)
Electrode
(Electric)
Exeggcute
(Grass, Psychic)
Exeggutor
(Grass, Psychic)
Cubone
(Ground)
Marowak
(Ground)
Hitmonlee
(Fighting)
Hitmonchan
(Fighting)
Lickitung
(Normal)
Koffing
(Poison)
Weezing
(Poison)
Rhyhorn
(Ground, Rock)
Rhydon
(Ground, Rock)
Chansey
(Normal)
Tangela
(Grass)
Kangaskhan
(Normal)
Horsea
(Water)
Seadra
(Water)
Goldeen
(Water)
Seaking
(Water)
Staryu
(Water)
Starmie
(Water, Psychic)
Mr. Mime
(Psychic)
Scyther
(Bug, Flying)
Jynx
(Ice, Psychic)
Electabuzz
(Electric)
Magmar
(Fire)
Pinsir
(Bug)
Tauros
(Normal)
Magikarp
(Water)
Gyarados
(Water, Flying)
Lapras
(Water, Ice)
Ditto
(Normal)
Eevee
(Normal)
Vaporeon
(Water)
Jolteon
(Electric)
Flareon
(Fire)
Porygon
(Normal)
Omanyte
(Rock, Water)
Omastar
(Rock, Water)
Kabuto
(Rock, Water)
Kabutops
(Rock, Water)
Aerodactyl
(Rock, Flying)
Snorlax
(Normal)
Articuno
(Ice, Flying)
Zapdos
(Electric, Flying)
Moltres
(Fire, Flying)
Dratini
(Dragon)
Dragonair
(Dragon)
Dragonite
(Dragon, Flying)
Mewtwo
(Psychic)
Mew
(Psychic)
Brock
(Rock)
Misty
(Water)
Lt. Surge
(Electric)
Erika
(Grass)
Koga
(Poison)
Sabrina
(Psychic)
Blaine
(Fire)
Giovanni
(Ground)
Absorb
(Grass)
Acid
(Poison)
Acid Armor
(Poison)
Agility
(Psychic)
Amnesia
(Psychic)
AuroraBeam
(Ice)
Barrage
(Normal)
Barrier
(Psychic)
Bide
(Normal)
Bind
(Normal)
Bite
(Normal)
Blizzard
(Ice)
Body Slam
(Normal)
Bone Club
(Ground)
Bonemerang
(Ground)
Bubble
(Water)
BubbleBeam
(Water)
Clamp
(Water)
Comet Punch
(Normal)
Confuse Ray
(Ghost)
Confusion
(Psychic)
Constrict
(Normal)
Conversion
(Normal)
Counter
(Fighting)
Crabhammer
(Water)
Cut
(Normal)
Defense Curl
(Normal)
Dig
(Ground)
Disable
(Normal)
Dizzy Punch
(Normal)
Double Kick
(Fighting)
Double Team
(Normal)
Double-Edge
(Normal)
DoubleSlap
(Normal)
Dragon Rage
(Dragon)
Dream Eater
(Psychic)
Drill Peck
(Flying)
Earthquake
(Ground)
Egg Bomb
(Normal)
Ember
(Fire)
Explosion
(Normal)
Fire Blast
(Fire)
Fire Punch
(Fire)
Fire Spin
(Fire)
Fissure
(Ground)
Flamethrower
(Fire)
Flash
(Normal)
Fly
(Flying)
Focus Energy
(Normal)
Fury Attack
(Normal)
Fury Swipes
(Normal)
Glare
(Normal)
Growl
(Normal)
Growth
(Normal)
Guillotine
(Normal)
Gust
(Normal)
Harden
(Normal)
Haze
(Ice)
Headbutt
(Normal)
Hi Jump Kick
(Fighting)
Horn Attack
(Normal)
Horn Drill
(Normal)
Hydro Pump
(Water)
Hyper Beam
(Normal)
Hyper Fang
(Normal)
Hypnosis
(Psychic)
Ice Beam
(Ice)
Ice Punch
(Ice)
Jump Kick
(Fighting)
Karate Chop
(Normal)
Kinesis
(Psychic)
Leech Life
(Bug)
Leech Seed
(Grass)
Leer
(Normal)
Lick
(Ghost)
Light Screen
(Psychic)
Lovely Kiss
(Normal)
Low Kick
(Fighting)
Meditate
(Psychic)
Mega Drain
(Grass)
Mega Kick
(Normal)
Mega Punch
(Normal)
Metronome
(Normal)
Mimic
(Normal)
Minimize
(Normal)
Mirror Move
(Flying)
Mist
(Ice)
Night Shade
(Ghost)
Pay Day
(Normal)
Peck
(Flying)
Petal Dance
(Grass)
Pin Missile
(Bug)
Poison Gas
(Poison)
Poison Sting
(Poison)
PoisonPowder
(Poison)
Pound
(Normal)
Psybeam
(Psychic)
Psychic
(Psychic)
Psywave
(Psychic)
Quick Attack
(Normal)
Rage
(Normal)
Razor Leaf
(Grass)
Razor Wind
(Normal)
Recover
(Normal)
Reflect
(Psychic)
Rest
(Psychic)
Roar
(Normal)
Rock Slide
(Rock)
Rock Throw
(Rock)
Rolling Kick
(Fighting)
Sand-Attack
(Normal)
Scratch
(Normal)
Screech
(Normal)
Seismic Toss
(Fighting)
Selfdestruct
(Normal)
Sharpen
(Normal)
Sing
(Normal)
Skull Bash
(Normal)
Sky Attack
(Flying)
Slam
(Normal)
Slash
(Normal)
Sleep Powder
(Grass)
Sludge
(Poison)
Smog
(Poison)
SmokeScreen
(Normal)
Softboiled
(Normal)
SolarBeam
(Grass)
SonicBoom
(Normal)
Spike Cannon
(Normal)
Splash
(Normal)
Spore
(Grass)
Stomp
(Normal)
Strength
(Normal)
String Shot
(Bug)
Struggle
(Normal)
Stun Spore
(Grass)
Submission
(Fighting)
Substitute
(Normal)
Super Fang
(Normal)
Supersonic
(Normal)
Surf
(Water)
Swift
(Normal)
Swords Dance
(Normal)
Tackle
(Normal)
Tail Whip
(Normal)
Take Down
(Normal)
Teleport
(Psychic)
Thrash
(Normal)
Thunder
(Electric)
Thunder Wave
(Electric)
Thunderbolt
(Electric)
ThunderPunch
(Electric)
ThunderShock
(Electric)
Toxic
(Poison)
Transform
(Normal)
Tri Attack
(Normal)
Twineedle
(Bug)
ViceGrip
(Normal)
Vine Whip
(Grass)
Water Gun
(Water)
Waterfall
(Water)
Whirlwind
(Normal)
Wing Attack
(Flying)
Withdraw
(Water)
Wrap
(Normal)