Attack FX R

Attack FX R is a badge that appears in  Paper Mario: The Thousand-Year Door .

In the game, Attack FX R gives Mario a new sound made when he uses his hammer and jump attacks. Attack FX R, like all other attack FX badges costs 0 BP and does not work on the partners in Mario's party. This badge is the only attack FX badge with an actual purpose, too.

The location of this badge can be quite tricky. It is only obtainable after Mario gets the ability to transform into a straight line of paper and can go through thin holes. With this new ability, Mario can by-pass the metal bars in prison cells in one of the rooms in Hooktail Castle. Inside one of these cages is this very badge.

As stated above, this badge has another purpose. When the battle with Hooktail  begins, if  Mario  has this badge equipped, he can weaken Hooktail by using a single attack. Hooktail hates crickets more than anything else in the world according to Kolorado's deceased father. With this info and this badge Mario can lower Hooktail's defense by one and attack by two after Mario attacks.