The Pokémon Trading Card Game is huge. It might be the biggest physical card game around right now, selling around 2 billion cards a year on average. Not to mention the major tournaments held on an annual basis that the Pokémon Company stream on their Youtube channel.
It’s also nigh unrecognisable from how it looked back when it first popped up in the early 2000s. Back then, most kids I knew just collected the cards, but very few of them actually played the game. I was one of the losers with an actual interest in playing the game properly, an opportunity that never really presented itself to me outside of a game on the Gameboy Color.