Well, for one thing it has developed into a legitimate staple in every format from Standard back to Vintage, along with seeing a decent amount of Commander play, so the demand is huge
Card Text Changes Attacks and Abilities on a Pokemon that refers to itself now use the phrase "This Pokemon" instead of the name of that Pokemon
The new special art rare gives strong primal vibes, and shows off the pseudo legendary in a glorious light
Usually, the energy type required is the same as the Pokemons type however if the card has a colorless symbol in its energy requirements you can use any energy card to fulfill that requirement
Its relatively cheap to start, easy to scale, and if you get good at identifying clean cards, the profit margins are some of the best in the hobby
The Pokmon Trading Card Game might be simpler than many other games in the genre, but there is still a fair amount of complexity that players need to understand to have success in the game