Damage inflicted on all Tonberrys will result in equal damage being dealt to all players in the following battle with the Tonberry King. The line of Tonberrys will move towards the right side of the screen and flee after two turns.
The Tonberry with 999 HP has a guaranteed Tonberry (Companion) drop. (Note: Press and hold an enemy to see its stats.) To get the companion drop without taking massive damage in the next battle, pincer the Tonberry with 999 HP using characters that do not have any area attacks.