Attack is a stat. It determines how strong regular attacks will be.
In Telefang 1, Kanzou has the highest base Attack, starting out with 22 Attack at Level 1. Pampas has the lowest, only starting out with 6 Attack. Kanzou also has the highest max Attack, who has 169 Attack at Level 99. Punica and Liriope tie for lowest, maxing out at 57 at Level 99.