Sets with iconic Pokmon like Charizard, Pikachu or the Eeveelutions generally grow better long-term than sets with less popular themes
Rotation serves several important purposes for the health and longevity of the Pokmon TCG: Maintains a Fresh Metagame: By removing older, potentially dominant cards and strategies, rotation forces players to innovate and create new decks using the currently legal card pool
With an incomprehensibly large print count like that, its not surprising that so many Pokmon error cards are on the market
Counterspells and spot removals like Pongify and Rapid Hybridization round out the deck
Plus, its card number, 214/198, indicates that it's a secret rare card, increasing its rarity and thus its value
Lastly, unless your deck has a bunch of graveyard recursion, shuffling your graveyard into your library can improve the density of nonland cards that youll be drawing later