Given there were originally 15 types of Pokemon back in the Red and Blue days and that has grown to 18 over the years, it makes sense to simplify things for the TCG
Booster Pack Pokemon Battle Styles Keep track of your collection value over time
Infect was the best deck in the format, with Affinity and Burn also being tier one, and the very idea that you could live long enough to tap out for a Jace, the Mind Sculptor on Turn 4 seemed insane
However, if four or more Pokmon possessing Hide n Sneak are already in the discard pile, the attack gains an additional 140 damage, turning Dhelmise into a surprisingly powerful late-game threat
X, Prime, EX, etc..) Generation 3 introduced Pokemon ex, which were a higher rarity than Holo Rares and placed after Special Energies in International Sets (but before Secret Rares and Basic Energy Cards.) Japan sets would include these in the main set alongside Common, Uncommon, and Rare Pokemon
Much like Craterhoof in Green, this will often be a game-ending card