This type chart is for generation 2 through 5

Defender
Attacker
Normal
Fire
Water
Electric
Grass
Ice
Fighting
Poison
Ground
Flying
Psychic
Bug
Rock
Ghost
Dragon
Dark
Steel
Custom
Normal
Fire
Water
Electric
Grass
Ice
Fighting
Poison
Ground
Flying
Psychic
Bug
Rock
Ghost
Dragon
Dark
Steel
Custom

Dual-type Attack Restrictions