The Poison type has been criminally under-developed in the Pokemon games. It is super-effective only against Grass (many of which are dual Poison so neutralizes the effect). In the first generation it was also super-effective against Bug but this was changed. It fares a little better defensively but its best advantage is through status moves like Toxic.
Poison moves are super-effective against:
Poison moves are not very effective against:
Poison moves have no effect on:
These types are not very effective against Poison pokemon:
These types are super-effective against Poison pokemon:
The chart below shows the strength of the Poison type against every type combination. The numbers in the squares show the fraction damage the move will do (i.e. ½ means 50% damage and not very effective, while 4 means 400% - super-effective).
For example, look where the Grass and Poison types intersect to see how good a Poison-type move would be against a pokemon like Venusaur. You will see that it is 100%.
There are 57 Poison-type pokemon.
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