Seaside Cave

Seaside Cave (Japanese:  Seaside Cave) is a cavern located between and Undella Bay. It is accessible as soon as the player gets to Undella Town; however, Rocky blocks the player from exploring further until Drayden has been defeated and the player has ridden Team Plasma from Opelucid City after they have frozen it. It is also the first area in the game where an HM is needed to proceed, with being required on Route 21 or Undella Bay to reach this area.

Geography
The cavern has two floors and three entrances. One is to Undella Bay, another to, and another goes to a separate area of Route 21, where the Plasma Frigate is found. The Colress MCHN can be used to awaken found here. The bottom floor has a puzzle.

In other languages
Strandgrotte Gruta Marina Grotte Littorale (Unys) Grotta Costiera うみべのどうけつ 海邊洞穴