Ultra Wormholes are special portals in the Pokémon universe that allow trainers to travel between different dimensions. These wormholes are often found in the Ultra Space region and can lead to various worlds, each containing unique Pokémon and challenges. In the games, players can access Ultra Wormholes using the Ultra Beast mechanics, which introduce powerful creatures from other dimensions. By navigating these wormholes, trainers can encounter rare Pokémon and explore new environments, enhancing their adventure in the Pokémon series.