Question

Since STAB means:

• Same
• Type
• Attack
• Bonus

How does it work for Dual Typed Pokemon?

Answer 1

They get the 50% type boost for moves of both of their types.

Example: Swampert gets STAB on both Earthquake and Waterfall.

Source: Experience.

Comments

Thanks Josh,Could you still give me a link to please?

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Abnormal, we don't need to provide links for everything.

This really doesn't NEED a link. Almost EVERY user on this site knows that they get STAB on both types of moves, and I'm pretty sure you already know it.

I'm not going through your stupid answer criteria crap.

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huh Harsh!,It could have been a simple NO! I don't ask question if I already know the answer BTW.
Stupid answer criteria? I didn't even put one on this question,when It all falls down It could have been a simple NO.Thank you very much.Thanks for the answer I don't want to argue so lets just leave it at this.

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What will be the % boost if It wasn't a Dual Typed Pokeman?

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Still 50%

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Oh ok Thanks,I could do without the link.This question really didn't need one ;P are we still cool?

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As usual. Just don't ask me for extra crap when it's not needed and we're cool.

Answer 2

STAB
STAB means same type attack bonus as you mentioned.
STAB increases the base power of an attack by 50%
Let's say Lucario (Steel/Fighting) uses Bone Rush, it gets no STAB of course so the base power would stay at 25.
BUT if Lucario uses Metal Claw he will get 75 base power instead of 50.
So same rules apply. If a Machamp uses Rock Smash the base power will be 60. If a Lucario uses Rock Smash it will have 60 base power just like the Machamp.

Source: http://bulbapedia.bulbagarden.net/wiki/Same-type_attack_bonus

Comments

I gave a Up-Vote thanks.

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Thanks :D

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Who downvoted me? This is stupid. Whoever did it remove the downvote because this clearly answers the question.