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Let's use Charizard as an example. It is 4x weak to Rock type attacks (2x Flying + 2x Fire). If Onyx uses Rock Slide on a Charizard, will the attack be 6x? (4x + 50% STAB)?

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Yes.

As you can see from the Damage Formula:

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where Modifier is:

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  • STAB is the same-type attack bonus. This is equal to 1.5 if the attack is of the same type as the user, and 1 if otherwise.
  • Type is the type effectiveness. This can be either 0, 0.25, 0.5, 1, 2, or 4 depending on the type of attack and the type of the defending Pokémon.
  • Critical is 2 for a critical hit in Generations I-V, 1.5 for a critical hit in Generation VI, and 1 otherwise.
  • other counts for things like held items, Abilities, field advantages, and whether the battle is a Double Battle or Triple Battle or not.
  • random is a random number from 0.85 to 1.00.

You can see that Type effectiveness and STAB are both applied to the final damage.

  • Solid formula you've got there. – wogsland Feb 12 '17 at 4:47
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Yes, STAB applies on top of any other damage modifications, multiplicatively. In this case, Charizard will take 6x damage.

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