Ozoomar00

when I logged in I was able to use headbutt on a tree which I did and got a ekans as a battle encounter after that I went to heal and then proceeded to combat my friend in a PVP battle after losing I was sent to the pokemon center and now I can no longer headbutt trees even though my pokemon Which is a Pikachu knows headbutt I've tried multiple trees and still can't headbutt even tried Re-logging any luck