Diglett's Cave
As a whole, the cave runs from the northwest to the southeast, passing under Celadon City, Route 7, and Route 6 as it progresses toward Vermilion from Pewter. There are no points of interest along the cave; however, the cave is the only location where wild Diglett and the rare Dugtrio are found in Kanto. The usefulness of the cave as a connector route between Routes 2 and 11 has allowed Diglett's Cave to become one of the most important non-numbered routes in the Pokémon world. In fact, after the player enters Cerulean City, the only way to return to Pewter City and Viridian City without using Surf or Fly is to travel through Diglett's Cave. In Pokémon HeartGold and SoulSilver, Brock will come to the northern entrance and give passers-by his Pokégear phone number.
