Hun's Steelix is a Steel/Ground-type Pokémon owned by Hun from Team Rocket.
Steelix is Hun's main battling Pokémon. According to him, it enjoys "coaxing aggression out of others." It was used to attack Raikou, as well as Jimmy, Marina, and Vincent. Even for a Steelix, which are known to be aggressive by nature, it seems particularly brutal and violent.