From the Super Mario Wiki
Retrieved from "http://www.mariowiki.com/index.php?title=Badge&oldid=1948165"
Badges are items used in several Mario role-playing games ever since their first appearance in Paper Mario, and have appeared in every RPG except Paper Mario: Sticker Star. Badges are equipped as accessories, similar to the weapons, armor and accessories from Super Mario RPG: Legend of the Seven Stars. The main difference is that, unlike the items in Super Mario RPG, Badges have a variety of uses depending on the game. They may increase stats, provide unusual abilities, or give characters access to new moves.
Paper Mario series
Each badge requires a certain amount of BP to be equipped, which means that Mario cannot equip all the badges at the same time. The more useful a badge, the more BP it requires. Instead of changing Mario's stats, badges have many uses, from prolonging Mario's Spin Dash to changing the sound effects of Mario's hammer and jump attacks. Some badges also allow Mario to use special attacks with the hammer and shoes that use FP.
Paper Mario: The Thousand-Year Door
In Paper Mario: The Thousand-Year Door, badges can instead be bought from the Lovely Howz of Badges in Rogueport. They can be traded for Star Pieces with Dazzle in Rogueport Sewers. Ms. Mowz can steal badges from enemies and enemies also occasionally drop badges when defeated. In this game, some badges have a "P" at the end of their names, they are identical to their non-"P" counterparts but affect Mario's partner instead. Equipping more than one of the same badge doubles the FP cost of the move for each extra badge equipped. Equipping more then one of the same attack badge increases the attack's power by 1 and/or increases the duration of the applied status effect by 1. Equipping multiple Charge badges gives Mario (or his partner) 1 extra power when charging. When both the W Emblem and L Emblem are equipped, Mario's clothes will change into Waluigi's clothes.
Super Paper Mario
Super Paper Mario eliminated the use of badges, as there was no RPG-style battling system. There are, however, two items that were badges in the past games: Power Plus and HP Plus. They retain their main purposes: Power Plus boosts the character's attack power by one, and HP Plus boosts the character's maximum Heart Points by five. Unlike the badges seen in the first two Paper Mario games, the effects of these items in Super Paper Mario are permanent. The Happy Flower, albeit distinctly different from its badge form, also appears in Super Paper Mario as an item.
Mario & Luigi series
Mario & Luigi: Superstar Saga
In Mario & Luigi: Superstar Saga, each bro can only wear one badge at a time. Badges are used to raise Mario or Luigi's Attack stat or their Bros. Points. Certain badges also allow different effects to be used in battle, such as defense from spiked enemies, HP recovery, and attacks with different effects, among others. In the game, badges can be bought in shops all around the Beanbean Kingdom or dropped from defeated enemies.
Mario & Luigi: Partners in Time
In Mario & Luigi: Partners in Time, Badges only give special effects to Mario, Luigi, Baby Mario, and Baby Luigi. clothing instead increases and decreases all the stats in this game. Badges can be found all around the Mushroom Kingdom of the past, dropped by enemies, in the present Kingdom's Item Shop, or bought from Fawful. Like the game's predecessor, only one badge can be given to each bro at a time.
Mario & Luigi: Bowser's Inside Story
Items known as Bros. Badges appear in Mario & Luigi: Bowser's Inside Story, in which they are used in battle by Mario and Luigi (but not Bowser). The first two badges are given to the player by Princess Lipid in the Flab Zone. When a gauge fills up, touching the two linked badges with the stylus activates the badge, yielding a variety of results, such as restoring health. The gauge is filled up by performing an attack in either a "GOOD", "GREAT" or "EXCELLENT" way (the requirements vary from badge to badge). Switching a badge during a battle will reset the gauge to zero. Some badges can be purchased at a shop in Toad Town and others can be found throughout the game. Luigi's badge (the left side of the gauge) determines how good the action command must be to fill the bar, and how big the effect will be. Mario's badge (the right side of the gauge) decides what the effect will be.
Mario & Luigi: Dream Team
Badges also reappear in Mario & Luigi: Dream Team. Both Mario and Luigi can equip one badge out of the 12 badges making 36 combinations. During battle, a Badge Meter on the bottom screen will fill up as the Mario Bros. attack successfully. When the two badges meet at any point on the meter, one of the circles on the bottom screen will show an icon. Touching the icon will do an action depending on what two badges are combined.
In the chart below, Mario's badges are listed across and Luigi's are listed downwards.
List of Badges
Names in other languages