Stylish Headbutt (スタイリッシュ頭突き Sutairisshu Zutsuki) is a keyword ability that activates when the card with this ability appears on Square. As of now, this ability is only possessed by "Splendorous Rock Smash, Kalavinka". It is also the name of the "special skill" of Kalavinka in the story.
The current explanatory text of Stylish Headbutt ability is shown below:
[Auto]Stylish Headbutt ( <Valid> Square <Trigger> This card appears. <Effect> If your Player is "Honome Chogasaki", choose 1 opponent's Z/X on Normal Square that isn't currently in battle, and put it onto Square without Z/X. If you do, Sleep that Z/X, that Z/X doesn't Reboot in your opponent's next Reboot Phase.)
Comprehensive Rules[]
1111 Stylish Headbutt
1111.1 Stylish Headbutt ability is an automatic ability that moves opponent's Z/X onto a designated Square and Sleep it from the appearance of a card.
1111.2 "Stylish Headbutt" means " <Player>≪Honome≫<Valid> Square <Trigger> This card appears. <Effect> Choose 1 opponent's Z/X on Normal Square that isn't currently in battle, and put it onto designated Square without Z/X. If you do, Sleep that Z/X, that Z/X doesn't Reboot in your opponent's next Reboot Phase."