>>35655524Because it's intimidating in both design and Ability, really strong in both lore and battle, and it shows up in just about every regional Pokedex ever. It's basically the perfect choice for a bossfight, which is why it's all the more surprising that Genwun only used it for that purpose once.
>>35655550Unironically this, besides dealing with unfortunate EV gains they're also the easiest way to blow through Happiness evolutions.