Gold Fuzzy

Gold Fuzzy is a gold-colored Fuzzy that resides in Shhwonk Fortress and attacks Mario and Goombella for barging into their territory in Paper Mario: The Thousand-Year Door. During battle, the Gold Fuzzy summons a Fuzzy Horde, which can be attacked; however, defeating the Gold Fuzzy drives the Fuzzy Horde away.

As Goombella explains, Gold Fuzzies do not drain Mario's HP

They appear in the back of the official Super Paper Mario guide, but don't actually appear in the game. This also happens in the Super Paper Mario Prima guide. It is unknown why they are there, but it is possible they were initially enemies but were removed from the game for unknown reasons.

Videos
Mario vs. Gold Fuzzy and the Fuzz Horde