Arena Tycoon Greta (anime)

Arena Tycoon Greta is a Frontier Brain appearing in Pokémon: Battle Frontier.

Trivia

 * Greta and Ash are barefoot during their entire battle, along with Brock, May, Max, and Scott, and Jesse and James as well. Greta is so strict on martial arts, she makes everyone remove their shoes and socks before entering. Ironically, her casual sneakers detract from the appearance of a full-fledged martial artist, unlike when she's in her bare feet.
 * Greta was the second Frontier Brain that Ash defeated.