Ash, Goh and Chloe head to Driftveil City in the Unova region after learning that a new evolved form of Klink has been discovered. There, they discover a hole that leads far into the underground, and Grookey and Eevee jump in out of curiosity. Ash and the others follow them, and discover that the hole led into a labyrinthic area. And when Team Rocket jump after them in their pursuit of Pikachu, things turn into a complete chase where everyone runs into each other....?! (Source: Wikipedia)
