https://bulbapedia.bulbagarden.net/wiki/Sobble_(Pok%C3%A9mon)
So according to Bulbapedia, Sobble, a combination of the words sob and bubble, is called Messon in Japanese, a combination of sobbing and chameleon, and is called Memmeon in German, a combination of sissy and chameleon. The creators weren't just making a shy chameleon, they were pretty explicitly going for crybaby chameleon.