Tentacruel is a Poison/Water-type Pokémon that was introduced in Generation I. It is the evolved form of Tentacool. Tentacruel is a large, jellyfish-like Pokémon with a body that is made up of a cluster of tentacles. It has a long, poisonous stinger at the end of each tentacle. Tentacruel is a very powerful Pokémon. Its tentacles can deliver a powerful poison that can paralyze and even kill its enemies. Tentacruel is also very fast and agile, making it difficult to hit. A fanart Pokémon progress bar for YouTube with Tentacruel.