Sliggoo is a gooey purple snail-like Pokemon. The top part of its body is a lighter shade of purple than its underside. Sliggoo has four long feeler-like horns atop its head and pale green spots lining its neck. When evolving from Goomy, Sliggoo's eyes devolved (resembling the green spots that Goomy had on its cheeks), so it is blind and must use its four feeler-like horns as a radar system to sense sounds and smells, as it lacks ears, a nose, and the ability to see. It has tiny stub-like arms on its deep purple underbelly, and a gooey snail-like shell on its back that seems to be part of its gelatinous body.
Despite being blind, Sliggoo can use its horns as a high-performance radar system, allowing it to sense the sounds and smells in its environment.
Sliggoo evolves from Goomy at level 40, and evolves into Goodra at level 50 (using moves or abilities to cause rain in a battle cannot make it evolve).