Octillery resembles a cross between an octopus and a tank. It has a red body, multiple tentacles (the front tentacles are used to manipulate objects while the rear tentacles serves no purpose besides stability), a turret-like mouth, a row of three yellow protrusions, and a pair of white slanted eyes that appears to make Octillery look sad. Octillery's tentacles are armed with yellow suction cups.
Octillery has the abilities Suction Cups and Sniper. Suction Cups prevents Octillery from being switched out by the moves Whirlwind and Roar, while Sniper triples Octillery's critical hit damage. Octillery will spray a cloud of brackish ink to obscure an opponent's vision. The ink sometimes have paralyzing components, which Octillery can utilize to immobilize prey before killing the victim with a rock hard head smash.
Octillery can learn many energy-based projectile attacks such as Flamethrower, Octazooka, Psychic, Ice Beam, Aurora Beam, Fire Blast, Energy Ball, Gunk Shot, and Charge Beam.