Headcanon: By "getting loose during battle", Kieran meant he can't see anything with his hair covering half of his face. But getting a haircut was the least of his concerns on his journey to become the champion at Blueberry Academy.
Based on his conversation with Carmine in the League Club Room.
I still find it amusing how pkmn breeding in SV happens in picnics... like, the implication of pkmn doing the do there? right in front of my salad?? and the way u can accidentally do the breeding when u just want to chill in the picnic?