It was formerly a starter Pokémon in Beta 2.0 of the game. This role was given to Raptorch in all subsequent game releases.
The size of the flame on FLAGER's tail indicates if it is close to evolving. Some Flager will intentionally eat flammable items to make it bigger.
Flager is a quadrupedal, feline Pokémon resembling the cub of a cheetah or tiger. Its fur is orange, and its legs end in red-colored paws with three toes, each toe bearing a tiny white claw. Two small flames can be seen on its rear legs, as well as a taller flame at the base of its spine, serving as its tail. It has two shiny red eyes, a brown nose, a red marking between its eyes that ends at the nose, and a small pair of fangs which protrude from its upper jaw. It has two rounded ears with red insides, and it has tufts of fur on the top of its head and on each cheek, as well as on its legs, chest, and around its tail.
The size of a Flager's tail flame indicates how close it is to evolving, though some Flager intentionally eat flammable objects in order to make their tails appear larger.