Along with Grookey and Scorbunny, it was the first Generation VIII Pokémon to be revealed to the public on February 27, 2019.
Sobble is a small Pokémon that has light blue skin with darker teal patches and a lighter blue belly and face. It has similar teal eyes with white pupils and scelerae. It also has a yellow fin-like protrusion from the top of its head bordered in dark blue, as well as a curled blue tail tipped in the same dark blue. It has thin limbs, each ending in two thin appendages, it can use these to stick to walls and easily climb them.
It can run around as both a quadruped and a biped, and use its forelimbs as arms. Sobble has the ability to camouflage itself in water where it hides itself. When it touches the water, Sobble's body changes its patterns and colors. This allows Sobble to blend into its surroundings. Due to being a bit timid, should Sobble get nervous or embarrassed, it will secrete water from its body like sweat in order to disappear into its surroundings. Sobble's tears can make others cry; the effect is so powerful that its tears are said to be as potent as 100 onions. Should it feel threatened, Sobble will start bawling and spreading its tears around the area, causing anyone near it to start crying uncontrollably. It will use this distraction as means to escape.
Sobble appears to be based on the veiled chameleon due to its color scheme being similar to that of the males. The way this species collects water droplets from its casque (the helmet-like protrusion on top of its head) into its mouth could resemble tears which could explain the tear-like patches on Sobble's face, its actual tears when crying, and its Water typing. Its typing, in addition to the crest on its head, are features that can also be more loosely related to basilisk lizards.
Sobble may be a combination of sob and bubble or dribble.
Messon may be a combination of メソメソ mesomeso (sobbing) and chameleon.