From the Super Mario Wiki
Gold Beanies are a rare type of Beanie that is found in Mario & Luigi: Superstar Saga and Mario & Luigi: Dream Team.
Mario & Luigi: Superstar Saga
Gold Beanies have more powerful attacks than Beanies, and as such net more experience points and coins for Mario and Luigi when defeated. However, they are extremely shy and more often run than attack. The Beanies and Gold Beanies in the Oho Ocean merely float up to the surface, without a need to fight them. Defeating a Gold Beanie will result in a rare badge called the Spike Badge, which allows Mario or
Luigi to jump on spiked enemies. If the Game Boy Horror SP is used, it will yield a Chuckola Badge instead.
Mario & Luigi: Dream Team
Gold Beanies once again reappear as an enemy in Mario & Luigi: Dream Team, (now called Golden Beanies in PAL versions). After coming back from Dream's Deep through the Dreamy Pi'illo Castle entrance, the player will encounter a Golden Beanie, escaping from Dreamy Broque Monsieur. The latter will explain that this Golden Beanie is a very rare and powerful enemy that only appears in dreams, and is said to grant legendary loot to whoever can defeat it. A single Golden Beanie may be found in dreams and in a single area afterwards. Gold Beanies are one of the most powerful enemies the player can encounter, but still run away when they can. Defeating one will result in a variety of loot, including more coins and experience points, a DX Bean of a random type, and will sometimes drop a rare piece of equipment.
Despite Broque Monsieur mentioning a single Golden Beanie, more may be found after the first one is defeated.
While in battle, the Golden Beanie can be knocked down by successfully countering his attacks. This will prevent him from fleeing.
- The Gold Beanie drops gear items as small Gifts rather than large Gifts, a rare case of this.
- The Gold Beanie is the only enemy in Mario & Luigi: Dream Team to drop four different (gear) items, the most any enemy has the potential to drop in the whole Mario & Luigi series.
- The Gold Beanies cry if they trip in Dream Team.
Names in other languages
||Gold Mamebo (Comes from Mame, or bean, and Kuribo, or Goomba)
||Gold Bean. Haba and judía are synonyms.
||Gold Poisec (Comes from Pois (bean) + sec (dry))