Octillery is a red, cephalopod-like Pokémon with large, round eyes and a turret-like mouth. There are yellow bumps on its rock-hard head and yellow suction cups on each of its eight tentacles. These suction cups and yellow bumps are smaller on a female Octillery. It uses its tentacles for manipulating objects and the suction cups give it strong gripping power. Because of this, it is very hard for it to be blown away. Octillery is the only known Pokémon that learns Octazooka naturally.
Octillery is a relaxed Pokémon who loves fuss from its Trainer. In the wild, it will spurt ink containing substances that dull predators' sense of smell to protect its young from danger. Even though it is more docile when domesticated, it can be very stubborn at times in the wild. It instinctively sneaks into rocky holes, and if it gets sleepy, it steals the nest of a fellow Octillery. It sometimes sprays ink on prey by sticking out only its mouth, and its suction cups hold prey tightly. Octillery is normally found in oceans.
It is also thought to be a distant relative to Omastar.
An Octillery appeared in Octillery The Outcast, under the ownership of Marcellus. It evolved from one of his Remoraid, a task that Marcellus had been spending the majority of the episode trying to do.
An Octillery appeared in The Pirates of Decolore!, where it was a powerful member of Croconaw's pirate gang, and would often battle any Pokémon it came across. Like the other Pokémon in the gang, Octillery was abandoned by its Trainer. However, it eventually joined Officer Jenny's new squad.
Octillery, the Jet Pokémon, will instinctively sneak into rocky holes. It locks onto opponents with its leg suckers, then rams them with its rock-hard head.
Octillery grabs onto its foe using its tentacles. This Pokémon tries to immobilize it before delivering the finishing blow. If the foe turns out to be too strong, Octillery spews ink to escape.
It ensnares its foe with its suction-cupped tentacles before delivering the finishing blow. If the foe turns out to be too strong, it spews ink to escape.
Octillery grabs onto its foe using its tentacles. This Pokémon tries to immobilize it before delivering the finishing blow. If the foe turns out to be too strong, Octillery spews ink to escape.