In Cianwood City, if you have only one Pokemon in your team and it does not know Fly or Surf, a generous Trainer in the island's Pokemon Center will give you a Level 15 Tentacool, claiming to have caught too many and was just about to release it before he noticed your situation. This was added to prevent the player from softlocking the game in Cianwood City by giving the player a Pokemon that can learn the Surf HM in order to leave. Additionally, it is possible for the Tentacool given to you to be Shiny.