The Tidal Passage is a short cave that opens from the north and the south end of Veilstone Cape. The ceiling of the passage hangs over the surface of the water, requiring the player to use RideBasculegion to pass through. The shape of the passage slightly curves to the east and west. At the center of the cave along the wall is a collection of etchings depicting various Legendary, Mythical, and noble Pokémon. These are similar to those find in Stone Portal.