As of now, going 1v1 with a human as Pachy can easily end in disaster if the human just commits to running in circles around your sides. The headbutt can't make contact while the human is free to shoot you without risk.
Give Pachy something to deal with this. His wide turning radius is the reason this can even be done, and his brace doesn't allow him to attack, even though it allows him to make tighter turns.
Carno has his wide sweeping head butt. Cerato has a tail strike. Just letting Pachy attack while bracing would probably be enough.