Hidden Legends arrived in 2004 as part of the EX era, a period that redefined competitive Pokémon TCG with powerful mechanics and stunning visual design. The set captured collector attention through premium artwork and strategically relevant cards that shaped tournament play. This era remains central to the hobby's modern foundation, with EX-era cards driving both casual and serious collecting interest today. Gloom represents the classic stage-two evolution line that defined early Pokémon TCG strategy. Its gentle, contemplative artwork appeals to collectors who appreciate the character-focused design philosophy of this period. Gloom's place in the Oddish family makes it a natural target for evolution line completionists and fans of the Grass-type Pokémon legacy.