In Unova, Scraggy have long headbutted nearly everything in sight, and the local trees have had to grow thick trunks and deep roots to avoid being toppled by these pokemon. Scraggy have paid no mind to this increased stiffness, for their aggressive behavior is too deeply rooted in evolution to change, and their heads are too thick to lose anything from headbutting trees except time better spent headbutting more fragile targets.
In this global era, however, pokemon travel long distances with their trainers – or without them, for with the pokemon storage system has come a burgeoning trade in exotic pokemon for trainers who can not personally travel. A population of Scraggy – most domestic, some feral – has recently established itself in Johto in this way, and its growth has been catastrophic to both the region's less sturdy trees and the numerous pokemon who use these trees as nests.
Headbutting trees has long been practiced in Johto on occasion as a way to locate and capture these pokemon, who are often too difficult to spot or defeat when not at rest, but Scraggy have taken this to another level. Their penchant for headbutting trees topples habitat, for their headbutts are far stronger than those of the native pokemon, who only shake lose pokemon from the branches. It is also typically followed up by headbutting the pokemon who fall out of them, many of whom are sleeping or exhausted. Because most of Johto's Scraggy are domestic, these pokemon are challenged for the purpose of training, and rarely serve as food, but the sheer number of Scraggy challengers and vigor with which they train has made it impossible for many of Johto's pokemon to rest!