Route 18

 is found on Mythic Island in the Serene region. It is a strenuous coast with two beaches. The waterway consists of clear, blue ocean water with a few small islands. It has become popular from divers and explorers that found the sunken remains of the ancient city of Ptolania. This city is about thirty-five thousand years old and crafted by the ancient Sereneans. This lost city said to have disappeared in one day and one night by a huge storm named "Suviboa," translated to the Yawn Cyclone. It now has many Trainers and swimmers with tons of wild Water-type Pokémon!

This path is accessible from the west via Viscose Port and from the north via Dralon Valley.