Each Pokémon has one or two Types which give it an advantage over some types, but also a disadvantage over others. These strengths and weaknesses also apply to Attacks and their types.
Damage on a "not very effective" attack is multiplied by 0.8, and on a "super effective" or STAB attack is multiplied by 1.25.
Types[]
Table[]
The following table contains all offensive effectiviness in a numeric way.