An abandoned plush doll became this Pokémon. They are said to live in garbage dumps and wander about in search of the children that threw them away.
– Pokemon Emerald Pokedex
Banette is one of the pure Ghosts introduced in Gen III. Based on a discarded doll. Its Pokedex entry is rather ominous (like many Ghost type’s Pokedex entries), saying that it’s seeking the child who threw it away.
Stat-wise, it has high Attack and decent Sp Attack. It’s one of the few Pokemon who learns Grudge by level-up, because it holds a grudge against the child that threw it away.