Market Dynamics
To obtain Umbreon in Pokémon GO, players must evolve their Eevee with a specific nighttime requirement. As this requires considerable gameplay, it creates a market for players to trade their existing Umbreons to those seeking to complete their collection. The scarcity of Umbreon, coupled with its popularity, has resulted in high market value for these Pokémon, with players willing to pay significant sums of Stardust and other in-game currency to acquire them.