Type Effectiveness Chart

This is the Type Effectiveness chart! Whenever a Move of one of the Types on the left targets a Pokémon, find its Type on the right to check for Type Effectiveness. Multiply the damage dealt, after defenses are applied, by the number shown above.
Note that Type Effectiveness does not generally affect Status Moves; only Physical and Special Moves are affected. Confuse Ray, for example, despite being Ghost type, is perfectly able to hit Normal Types.
Moves like Sonic Boom or Counter, on the other hand, despite having non-standard Damage, are affected by Immunity, though not by resistance.
Unlike Pokémon, Trainers do not have a Type, and thus all attacks by default do Neutral damage to them.
Type-Effectiveness is a bit more complicated if the defender has two types:
» If both Types are neutral, the attack of course is simply neutral
» If both Types are resistant, the attack is doubly resisted and does 1/4th damage
» If both Types are weak, the attack is doubly super-effective and does x2 damage.
» If one Type is weak and one is resistant, the attack is neutral.
» If either Type is Immune, the attack does 0 damage.
» In cases where Pokémon gain more than two Types, attacks may be triply resisted or triply super-effective. Triply resisted attacks do 1/8th damage, and triply super-effective attacks do x3 damage.
Be sure to note that allied effects from Moves can ignore Immunity and effects that tell you to ignore all effects from a Type of Move. For example, Aromatherapy can affect allies even if those allies have Sap Sipper, and Aromatherapy does not trigger the Attack Combat Stage Boost on those allies.
In addition to the Type Effectiveness for damaging attacks, several Types have their own quirks that are important in battle as well!
» Electric Types are immune to Paralysis
» Fire Types are immune to Burn
» Ghost Types cannot be Stuck or Trapped
» Grass Types are immune to the effects of all Moves with the Powder Keyword
» Ice Types are immune to being Frozen
» Poison and Steel Types are immune to Poison

» Immune: x0 Damage
» Triply Resisted: .125 (1/8th) Damage
» Doubly Resisted: x.25 Damage
» Resisted: x.5 Damage
» Neutral: x1 Damage
» Super-Effective: x1.5 Damage
» Doubly Super-Effective: x2 Damage
» Triply Super-Effective: x3 Damage