40 Pokémon in Pokémon Blue that deal 2× damage topoison
Hit it with
groundpsychicbug
caterpie
bug
metapod
bug
butterfree
bugflying
weedle
bugpoison
kakuna
bugpoison
beedrill
bugpoison
sandshrew
ground
sandslash
ground
nidoqueen
poisonground
nidoking
poisonground
paras
buggrass
parasect
buggrass
venonat
bugpoison
venomoth
bugpoison
diglett
ground
dugtrio
ground
abra
psychic
kadabra
psychic
alakazam
psychic
geodude
rockground
graveler
rockground
golem
rockground
slowpoke
waterpsychic
slowbro
waterpsychic
onix
rockground
drowzee
psychic
hypno
psychic
exeggcute
grasspsychic
exeggutor
grasspsychic
cubone
ground
marowak
ground
rhyhorn
groundrock
rhydon
groundrock
starmie
waterpsychic
mr-mime
psychic
scyther
bugflying
jynx
icepsychic
pinsir
bug
mewtwo
psychic
mew
psychic