ACCCIOOWWW, better known as Accio or Baeporeon is a female Vaporeon owned by Athena. She was obtained as an Eevee in Celadon City and was evolved using a Water Stone. During the double against Young Couple Lea and Jed, she was involved in a friendly fire incident with Butterbae, resulting in the enemy and friendly fire knocking her out.
Accio is a spell in the Harry Potter series. It is visually similar to Vaporean's given name.
"Bae" is a slang term for a significant other. Given the feminine redesigns of the sprites, terms such as "waifu" and "bae" have become abundant. In this case, "bae" was substituted for the acoustically similar "vae" in Vaporeon.