A drawing of E-38 Octoron from Sonic X.
Octoron is an octopus robot with flexible tentacles and 4 legs for land movement.
Octorn appeared in episode 9 "The Last Resort", where it uses its tentacles to try to drown Sonic. Amy is able to destroy the tentacles and Sonic is able to finish it with a Power Ring.
E-38 Octoron - Sonic X/Sega