Type chart
From Bulbapedia, the community-driven Pokémon encyclopedia.
A type chart shows which modifiers are applied to move types when attacking Pokémon of each type. The type chart differs depending on the generation of games it is from.
The biggest different between the two charts is the addition of the Dark and Steel types to the second chart. Among relationships that were already in the chart, Bug was made .5 effective against Poison instead of 2, Poison was changed from 2 to 1 against Bug, and Bug was changed from 1 to .5 against Ghost. Ghost was made double-effective against Psychic, as opposed to not effective at all.
