Tentacool resembles a box jellyfish. It has a light blue, clear body with two large, transparent, red crystals on each side of its body, and one small one in the middle. It has two small eyes with black pupils and no visible irises near the base of its body. It has two tentacles laced with stinging cells. The tentacles extend from beneath its round, blue lower body, which has a cape-like formation in the back.
Tentacool absorbs sunlight and refracts it using water inside its body to convert it into beam energy.
This Pokémon shoots beams from its crystal-like eyes, and are often found floating in shallow waters.
Tentacool can be found throughout the ocean, usually congregating in places where warm currents and cold currents come together, and where minerals are plentiful. They are extremely common in Kanto and Johto.
This Pokémon was unavailable prior to Generation I.