Gold Beetles (commonly known by their abbreviation GB) is a currency in Lioden. Unlike SB, they are harder to obtain. You have less options to get GB unlike SB, and some of the ways you can obtain GB is by buying them from Oasis with real money, winning raffles, Buying them through trades in the Trading Center or Oasis GB Sales and being sent gifts containing them (December event or not).
Usually you can find people that have been on Lioden for a period of time with GB. You can spend GB for quite interesting items, such as bonus cub stages (Cub Newborn and Cub Young). GB can also be spent for backgrounds and accessories. Some people are known to do "veiled" begging for GB being that they have none, or don't have enough, making it a popular item for veiled begging. but if you trade enough you may be able to obtain some GB. You can also use GB to trade and get mutations for your lions, or lions with mutations already.