Gen 1 type chart
For Red, Blue and Yellow. There are 15 types: no Dark, Steel or Fairy.
GhostPoisonHP
Hit GENGAR with Ground for 2× damage. It's super effective!
Moves against Gengar
Full page2×
½×
¼×
0×
DEF →ATK ↓
0
½
0
¼
2
2
2
Fire moves hit
Super effective
Not very effective
Fire Pokémon take
Weak to
Resists
2 Super effective½ Not very0 No effectRows attack, columns defend.
What's different here
Ghost can’t hit Psychic. Listed as 0× because of a programming error. Later games made it 2×.
Bug hits Poison for 2×. Later games made this ½×.
Poison hits Bug for 2×. Later games made this 1×.
Ice is neutral on Fire. Later games made this ½×.