Butterfree

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Butterfree (バタフリー, Batafurii) is a Bug/Flying-type Pokémon introduced in Generation I. In Super Smash Flash 2, Butterfree appears as a background character

Pokémon description
Butterfree is an insect-like Pokémon appearing as a large butterfly. Butterfree has a large purple body with light blue limbs and a nose with very small fangs. Its eyes are quite large in proportion to its head and are a red color. Butterfree's large wings simply appear as black and white butterfly wings. The gender difference is the female has purple on the bottom of its wings and the male doesn't.

In Super Smash Flash 2
In SSF2, a male Butterfree appears as a background character of Saffron City. It will fly around the stage and has no effect on the match.