• English / United States: Marina's Tentacruel
• Japanese / Japan: ツバキのドククラゲ
• Japanese (Romanized) / Japan: Tsubaki no Dokukurage
• Japanese (TL) / Japan: Tsubaki's Dokukurage

Tentacruel is Marina's Pokémon and because it is a water Pokémon, Marina is very fond of it. Whilst traveling around the Orange Islands she and her Tentacruel rescued Misty's Psyduck from drowning in the sea. After realizing Misty was a water Pokémon trainer who also shared a fondness for water Pokémon they became fast friends although they had a Pokémon battle to determine who the best water Pokémon trainer is. Tentacool managed to defeat Misty's Goldeen but was defeated by her Staryu