Sword & Shield marked a significant turning point for Pokémon TCG, arriving in 2020 just as the hobby experienced explosive renewed interest. This base set introduced the Galar region and became one of the most sought-after releases of the modern era, driving widespread demand across all products. Reverse holos from this set remain popular with collectors building complete sets and pursuing nostalgic pieces from the pandemic-era boom. Rillaboom, the final evolution of Grookey, represents the Grass-type ace of the Galar region. Its dynamic artwork captures the character's energetic personality and percussion-based nature. Fans of the generation and players who chose this starter frequently pursue its cards, making reverse holos of Rillaboom consistently desirable across the collecting community.