"to keep from being blown away by the wind, they gather in clusters. But they do enjoy gentle breezes."
Typically, each region of Pokemon have a singular or set of Pokemon that is meant to be an embodiment of a type (outside of the starter Pokemon that is). For Johto, you could argue that Grass-Types are represented by Hoppip and its evolutions. Though a little odd, as they're constantly getting blown around the region, you have to admit, that's what grass does when plucked.
Hoppip's Basic Attacks are Tackle and Bullet Seed, while its Special Attacks are Grass Knot, Dazzling Gleam and Sludge Bomb.