Mega Quake

Mega Quake is a badge in Paper Mario. It can be bought from Rowf and Rhuff's badge shop after chapter 5 for 200 coins. If the badge is equipped by Mario, he gains the ability to perform the Mega Quake move using the hammer, an upgraded form of Power Quake, for seven FP. On use, Mario slams on the ground with his hammer, creating a big shockwave that deals massive damage to all enemies on the floor and ceiling, though enemies that are floating or flying are unaffected. Though the badge was found in the code of Paper Mario: The Thousand-Year Door, it is not seen in-game in any capacity. Functionally, the badge is replaced by Quake Hammer, which lets Mario perform stronger quakes by equipping copies of the badge at the cost of spending more FP per use.

Merluvlee's predictions in Paper Mario

 * "I see...a Mega Quake Badge. It is for sale at the open-air shop in the plaza outside the castle gate."