The Sword & Shield era marked a significant moment for Pokémon TCG, arriving as the franchise celebrated 25 years of trading card history. This period saw renewed collector interest and accessibility, with special releases like the Cosmos Holo Exclusive targeting both longtime fans and newcomers. These early 2020s sets established modern collecting standards and remain foundational to contemporary player and collector collections. Rillaboom represents the Galar region's grass-type starter evolution, a fan-favorite design that captures the character's energetic personality. The Cosmos Holo treatment gives this card a distinctive prismatic finish that enhances its visual appeal, making it particularly sought after by those building complete set collections or showcasing their favorite Pokémon from Sword & Shield's generation.