The Goldeen Costume Pikachu Promo (150/XY-P), released on June 26, 2015, is a standout example from the Pokémon Trading Card Game's promotional offerings, particularly notable for its vibrant design and limited availability.

As a PSA 10 graded card, it exemplifies the pristine condition that serious collectors seek, enhancing its desirability within the context of Japan's robust collectible market.

Pokémon cards featuring Pikachu, especially in unique costumes, consistently attract strong demand due to the character's iconic status and the nostalgia associated with the franchise.

Given the rarity of such promotional items, particularly those graded highly, this card is poised to be a coveted piece in any collection focused on premium Pokémon memorabilia.