Wubbox is available for purchase in the Market for 75,000,000 Coins (or 150,000 Shards on Ethereal Island). After a 2-day incubation period, it's placed in Box form and activated by boxing all necessary Monsters. Variants like Rare Wubbox and Epic Wubbox are available in the StarShop and Market respectively, each with distinct incubation and activation requirements.