In the world of Pokémon, "Dual Types" refer to Pokémon that possess two different elemental types simultaneously. For example, a Pokémon like Charizard is both a Fire and Flying type. This duality allows Pokémon to have a wider range of strengths and weaknesses, making battles more strategic and dynamic. Having dual types can enhance a Pokémon's abilities, as it can learn moves from both types. However, it also means that the Pokémon may have more vulnerabilities. For instance, a Water/Flying type like Gyarados is weak to Electric moves, which can create interesting challenges in gameplay.