Grapploct is a blue amphibious octopus-like Pokemon with a yellow jagged eyemask-like marking, suckers, and what appears to be a breathing organ on the side of its head. It has a dark blue underside and cyan eyes. Four of its eight tentacles act as arms, three act as legs and one is wrapped round its waist. Its mouth is hidden under the bottom flap of its head.
With a body made of pure muscle, it gives it very powerful grip strength. It enjoys fighting opponents, and moves onto the land to fight them, before returning to its ocean home. Golisopod is natural predator or prey of Grapploct depending on who wins the fight.
Grapploct appears to be based on an octopus with jujutsu fighter motifs. Its face design appears to be based on a wrestling mask, while the tentacle around its waist resembles a martial artist's belt. It may also reference octopus wrestling practices popular on the West Coast of the United States during the 1960s, which involved a diver grappling with a large octopus in shallow water and dragging it to the surface.
Grapploct may be a combination of grapple, octopus, and locked.
Otosupasu may be a combination of 落とす otosu (to take someone down) and octopus.