Whiptail

Whiptail is the grown-up form of Whiplash. They are of the Regular type.

Beastimons.com Description
Whiptails are so used to the sting of their whip while training as a Whiplash, that they feel no pain. Whiptails use their tail to discipline unruly Whiplash. They tend to use their tail against other Beastimon that are much bigger than they are; it usually ends badly.