Jessiebelle is an enemy to the Uncreative clan as of Season 2.
Jessiebelle was introduced in the Pokémon episode "Holy Matrimony", where it was clear she was overbearing and somewhat crazy as she tried to get James to marry her. She wields a whip and is implied to be kinky.
Jessiebelle is Mew's rival for James, so Mew hates Jessiebelle and vice versa. Mew protects James when Jessiebelle attacks. When she does come around, Jessiebelle acts crazy and stalks James. The UC fears her. Enemies