Much of this comes down to how the game was designed in these early years: archetypes were less of a consideration when the anime was at its peak, with such ideas only really coming about later as the game evolved and became more strategic
In the mainline games, Gloom has typically served as a mid-stage Pokmon, offering a bridge for players between the early game and more complex team strategies
Since the body matching is 2/2, it can be used as an excellent absorber while adding moderate damage
In the 99 of a beatdown Najeela, The Blade Blossom deck
Phantazmay is, all in all, a Yu-Gi-Oh
Enter the Golgari Sleeves, inspired by the black-green Golgari guild from the Magic: The Gathering multiverse