>>56123252Instead it's some strange, unexplainable natural defence mechanism of the organism the ball triggers, like a reflex action on a knee strike. I might add, it's lore that comes from the very earliest days of Capsule Monsters and that they were thinking of how to make this shit work back when they started making the series in the first place, but tv's a hell of a cult leader.
The non-pokémon vegetation are foodstuffs and while in the real world, they are in an evolutionary arms race with the herbivores that eat them, the pokémon world explicitly rejects the laws of the natural world by the very existence of pokémon. Ergo, the plants are functionally paperstock and background dressing for the universe. Want to go even further, they were created explicitly by Arceus to not be harmful to Its creations, just as It created pokémon to be the other half of a human's whole potential.