"Lillie's Determination" is an Ultra Rare Holofoil card from the Mega Evolution set, numbered #169. Valued at $22.10, it holds a notable place in the Pokémon Trading Card Game market, appealing to collectors for its artwork and competitive utility. As interest in the Mega Evolution set continues, this card's rarity and gameplay relevance contribute to its value, making it a sought-after item for both players and collectors alike.